COMPOSITION CONTAINING AN ALK5 INHIBITOR, EW-7197

Abstract

Disclosed is a pharmaceutical composition containing EW-7197 (2-fluoro-N-((5-(6-methylpyridin-2-yl)-4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-1H-imidazol-2-yl)methyl)aniline), a pharmaceutically acceptable salt thereof, or a solvate thereof as an active ingredient useful in the treatment and prevention of a disease state mediated by transforming growth factor-β (TGF-β) type I receptor (ALK5).

Claims

1. A composition for treating or preventing a disease state mediated by transforming growth factor-β (TFG-β) type I receptor (ALK5) in human, comprising an effective amount of EW-7197 (2-fluoro-N-((5-(6-methylpyridin-2-yl)-4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-1H-imidazol-2-yl)methyl)aniline) or a pharmaceutically acceptable salt thereof, or a solvate thereof.

2. The composition of claim 1, wherein the composition is for reducing the accumulation of excess extracellular matrix (ECM) in human by inhibiting the TFG-β signaling pathway, for example, inhibiting the phosphorylation of Smad2 or Smad3 by ALK5.

3. The composition of claim 1, wherein a disease state mediated by ALK5 or accumulating excess ECM by inhibiting the TFG-β signaling pathway is glaucoma, glaucoma filtration surgery bleb failure, intraocular pressure, cataract, posterior capsule opacification (PCO; secondary cataract), corneal haze, wet age-related macular degeneration (AMD), proliferative vitreoretinopathy (PVR), proliferative diabetic retinopathy (PDR), Fuchs' endothelial corneal dystrophy (FECD), congenital ectopia lentis (CEL), postsurgical peritoneal adhesions, postsurgical anastomotic strictures, hypertrophic scar, or keloid.

4. The composition of claim 1, wherein EW-7197 or a pharmaceutically acceptable salt thereof, or a solvate thereof is in the composition at a concentration of about 0.001% w/v to about 0.5% w/v.

5. The composition of claim 1, wherein EW-7197 or a pharmaceutically acceptable salt thereof, or a solvate thereof is in the composition at a concentration of about 0.01% w/v to about 0.2% w/v.

6. The composition of claim 1, wherein said composition further comprises an ophthalmologically acceptable solvent, diluting agent, liquid vehicle, preservative, stabilizer, solubilizer, viscosity enhancer, penetration enhancer, tonicity agent, gelling agent, buffering agent, wetting agent, or antioxidant.

7. The composition of claim 4, wherein said composition further comprises an ophthalmologically acceptable solvent, diluting agent, liquid vehicle, preservative, stabilizer, solubilizer, viscosity enhancer, penetration enhancer, tonicity agent, gelling agent, buffering agent, wetting agent, or antioxidant.

8. The composition of claim 5, wherein said composition further comprises an ophthalmologically acceptable solvent, diluting agent, liquid vehicle, preservative, stabilizer, solubilizer, viscosity enhancer, penetration enhancer, tonicity agent, gelling agent, buffering agent, wetting agent, or antioxidant.

9. The composition of claim 6, wherein said solubilizer is tyloxapol, polysorbate 80, PEG-40 stearate (MYS-40), PEG-60 hydrogenated castor oil (HCO-60), poloxamer, polyethylene glycol (PEG), PEG/tyloxapol, or PEG/poloxamer.

10. The composition of claim 6, wherein preferred solubilizer is PEG/poloxamer.

11. The composition of claim 9, wherein preferred poloxamer is poloxamer 188 or poloxamer 407, and preferred PEG is PEG4000.

12. The composition of claim 1, which is an eye drop.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and other features of the present invention will now be described in detail with reference to certain exemplary embodiments thereof, illustrated in the accompanying drawings, which are given hereinbelow by way of illustration only, and thus are not limitative of the present invention, and wherein:

[0046] FIG. 1a to 1d shows thermal stability of EW-7197 in buffers (25° C.),

[0047] FIG. 2a to 2b shows photostability of EW-7197 in buffers (ultraviolet and visible light),

[0048] FIG. 3 shows solubility of EW-7197 with various solubilizing agents (4° C. and 25° C.),

[0049] FIG. 4a to 4b shows solubility of EW-7197 at various concentrations of surfactant, PEG4000, and niacinamide (4° C. and 25° C.),

[0050] FIG. 5a to 5b shows solubility of EW-7197 when tyloxapol, PEG4000, and niacinamide are used in combination (4° C. and 25° C.),

[0051] FIG. 6a to 6b shows thermal stability of EW-7197 with various surfactants (40° C.),

[0052] FIG. 7a to 7c shows thermal stability of EW-7197 with various stabilizing agents (40° C.),

[0053] FIG. 8 shows HPLC chromatograms of the formulation containing no stabilizing agent and the formulation containing EDTA,

[0054] FIG. 9a to 9b shows thermal stability of formulations with sodium thiosulfate (25° C. and 40° C.),

[0055] FIG. 10 shows thermal stability of EW-7197 in various buffers (40° C.),

[0056] FIG. 11a to 11b shows effect of metal ion on thermal stability of EW-7197 (40° C.),

[0057] FIG. 12a to 12b shows solubility of EW-7197 in PEG/poloxamer formulation (5° C. and 25° C.),

[0058] FIG. 13 shows thermal stability of EW-7197 at various concentrations of poloxamer 407 (40° C.) (formulation number: N05, N06, and N07),

[0059] FIG. 14 shows thermal stability at various concentrations of EW-7197 (40° C.) (formulation number: N04, N08, N12, and N13), and

[0060] FIG. 15 shows thermal stability of 25% PEG4000/10% poloxamer 407 formulation of EW-7197 with various viscous agents (40° C.).

DETAILED DESCRIPTION

[0061] The objects described above, and other objects, features and advantages of the present invention, will be clearly understood from the following preferred embodiments with reference to the attached drawings. However, the present invention is not limited to the embodiments, and may be embodied in different forms. The embodiments are suggested only to offer a thorough and complete understanding of the disclosed context and to sufficiently inform those skilled in the art of the technical concept of the present invention.

[0062] Unless the context clearly indicates otherwise, all numbers, figures and/or expressions that represent ingredients, reaction conditions, polymer compositions and amounts of mixtures used in the specification are approximations that reflect various uncertainties of measurement occurring inherently in obtaining these figures, among other things. For this reason, it should be understood that, in all cases, the term “about” should be understood to modify all numbers, figures and/or expressions. In addition, when numerical ranges are disclosed in the description, these ranges are continuous and include all numbers from the minimum to the maximum including the maximum within each range unless otherwise defined. Furthermore, when the range refers to an integer, it includes all integers from the minimum to the maximum including the maximum within the range, unless otherwise defined.

[0063] It should be understood that, in the specification, when a range is referred to regarding a parameter, the parameter encompasses all figures including end points disclosed within the range. For example, the range of “5 to 10” includes figures of 5, 6, 7, 8, 9, and 10, as well as arbitrary sub-ranges, such as ranges of 6 to 10, 7 to 10, 6 to 9, and 7 to 9, and any figures, such as 5.5, 6.5, 7.5, 5.5 to 8.5 and 6.5 to 9, between appropriate integers that fall within the range. In addition, for example, the range of “10% to 30%” encompasses all integers that include numbers such as 10%, 11%, 12% and 13% as well as 30%, and any sub-ranges of 10% to 15%, 12% to 18%, or 20% to 30%, as well as any numbers, such as 10.5%, 15.5% and 25.5%, between appropriate integers that fall within the range.

[0064] The present invention is described hereinafter. Throughout the entire specification, a singular expression should be understood as encompassing the concept thereof in the plural form, unless specifically noted otherwise. Thus, singular articles (e.g., “a”, “an”, “the”, and the like in the case of English) should also be understood as encompassing the concept thereof in the plural form, unless specifically noted otherwise. Further, the terms used herein should be understood as being used in the meaning that is commonly used in the art, unless specifically noted otherwise. Therefore, unless defined otherwise, all terminologies and scientific technical terms that are used herein have the same meaning as the general understanding of those skilled in the art to which the present invention pertains. In case of a contradiction, the present specification (including the definitions) takes precedence.

[0065] As used herein, “pharmaceutically acceptable salt” refers to an inorganic or organic acid addition salt of the compound of the invention that is relatively non-toxic. These salts can be prepared by reacting a compound purified temporarily between the final isolation and purification of a compound or by a free base form separately with a suitable organic or inorganic salt, and isolating a salt formed in this manner.

[0066] Examples of pharmaceutically acceptable basic salts of the compound of the invention include alkali metal salts such as sodium salts and potassium salts; alkaline earth metal salts such as calcium salts and magnesium salts; ammonium salts; aliphatic amine salts such as trimethylamine salts, triethylamine salts, dicyclohexylamine salts, ethanolamine salts, diethanolamine salts, triethanolamine salts, procaine salts, meglumine salts, diethanolamine salts, and ethylenediamine salts; aralkylamine salts such as N,N-dibenzylethylenediamine and benetamine salts; heterocyclic aromatic amine salts such as pyridine salts, picoline salts, quinoline salts, and isoquinoline salts; quaternary ammonium salts such as tetramethylammonium salts, tetraethylammonium salt, benzyltrimethylammonium salts, benzyltriethylammonium salts, benzyltributylammonium salts, methyltrioctylammonium salts, and tetrabutylammonium salts; basic amino acid salts such as arginine salts and lysine salts; and the like.

[0067] Examples of pharmaceutically acceptable acidic salts of the compound of the invention include inorganic acid salts such as hydrochlorides, sulfates, nitrates, phosphates, carbonates, hydrogen carbonates, and perchlorates; organic acid salts such as acetates, propionates, lactates, maleates, fumarates, tartrates, malates, citrates, and ascorbates; sulfonates such as methanesulfonates, isethionates, benzenesulfonates, and p-toluenesulfonates; acidic amino acids such as aspartates and glutamates; and the like.

[0068] As used herein, “solvate” refers to a solvate of the compound of the invention or a pharmaceutically acceptable salt thereof, encompassing, for example, a solvate of an organic solvent (e.g., alcohol (ethanol or the like)-ate), hydrate, and the like. When forming a hydrate, this can be coordinated with any number of water molecules. Examples of hydrates include monohydrates, dihydrates, and the like.

[0069] The preferred embodiments are described hereinafter. It is understood that the embodiments are exemplification of the present invention, so that the scope of the present invention is not limited to such preferred embodiments. It should be understood that those skilled in the art can refer to the following preferred embodiments to readily make modifications or changes within the scope of the present invention. Any of these embodiments can be appropriately combined by those skilled in the art.

[0070] In one aspect, the present invention provides a composition for treating or preventing a disease state mediated by ALK5, comprising an effective amount of EW-7197 (2-fluoro-N-((5-(6-methylpyridin-2-yl)-4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-1H-imidazol-2-yl)methyl)aniline) or a pharmaceutically acceptable salt thereof, or a solvate thereof.

[0071] In some embodiments, the composition of the invention is for reducing the accumulation of excess ECM by inhibiting the TFG-β signaling pathway, for example, inhibiting the phosphorylation of Smad2 or Smad3 by ALK5.

[0072] In another aspect, the present invention provides a composition for treating or preventing glaucoma, glaucoma filtration surgery bleb failure, intraocular pressure, cataract, posterior capsule opacification (PCO; secondary cataract), corneal haze, wet age-related macular degeneration (AMD), proliferative vitreoretinopathy (PVR), proliferative diabetic retinopathy (PDR), Fuchs' endothelial corneal dystrophy (FECD), congenital ectopia lentis (CEL), postsurgical peritoneal adhesions, postsurgical anastomotic strictures, hypertrophic scar, or keloid, comprising an effective amount of EW-7197 or a pharmaceutically acceptable salt thereof, or a solvate thereof.

[0073] The composition of the invention can be a pharmaceutical composition (e.g., eye drop, intracameral injection, intravitreal injection, subconjunctival injection, or intraperitoneal administration for postsurgical peritoneal adhesions and strictures). A pharmaceutical composition can further comprise a pharmaceutically acceptable carrier. Examples of pharmaceutically acceptable carriers include, but are not limited to, any solvents, diluting agents, liquid vehicles, preservatives (e.g., benzoic acid, benzalkonium chloride, benzethonium chloride, benzyl alcohol, butylparaben, cetrimonium bromide, cetylpyridinium chloride, chlorobutanol, chlorocresol, cresol, ethylparaben, methylparaben, methylparaben sodium, phenol, phenoxyethanol, phenylethyl alcohol, phenylmercuric acetate, phenylmercuric nitrate, potassium benzoate, potassium sorbate, propylparaben, propylparaben sodium, sodium metabisulfite, sodium benzoate, sodium dehydroacetate, sodium propionate, sorbic acid, thimerosal, and thymol), stabilizers (e.g., disodium edetate dihydrate (EDTA), sodium thiosulfate hydrate, dibutylhydroxytoluene (BHT), mannitol, polyethylene glycol 4000 (PEG4000), niacinamide, and hypromellose 60SH-4000 (HPMC 60SH-4000)), solubilizers (e.g., poloxamer 188, poloxamer 338, poloxamer 407, polysorbate 20, polysorbate 80, tyloxapol, PEG-40 stearate (MYS-40), PEG-60 hydrogenated castor oil (HCO-60), benzalkonium chloride, metolose SM-25 (MC SM-25), hypromellose 60SH-50 (HPMC 60SH-50), hypromellose 60SH-4000 (HPMC 60SH-4000), carmellose sodium (CMC), povidone K-30 (PVP), lipidure-PMB (Lipidure), polyethylene glycol 400 (PEG400), polyethylene glycol 4000 (PEG4000), propylene glycol (PG), glycerin, and niacinamide), viscosity enhancers (e.g., xantan gum, carmellose sodium (CMC), and hypromellose 60SH-4000 (HPMC 60SH-4000)), penetration enhancers (e.g., benzalkonium chloride, polyoxyethylene glycol ethers (lauryl, stearyl, and oleyl), disodium edetate dihydrate (EDTA), sodium taurocholate, saponins, cyclodextrins, and cremophor EL), tonicity agents (e.g., dextrose, glycerin, mannitol, potassium chloride, niacinamide, and sodium chloride), gelling agents (e.g., acacia, alginic acid, carmellose sodium (CMC), gelatin, hydroxyethyl cellulose, hydroxypropyl cellulose, magnesium aluminum silicate, methylcellulose, poloxamer 188, poloxamer 407, polyvinyl alcohol, sodium alginate, tragacanth, and xanthan gum), buffering agents (e.g., sodium acetate, ammonium acetate, trisodium citrate, sodium dihydrogen phosphate, boric acid, sodium borate, and trometamol), wetting agents (e.g., benzalkonium chloride, benzethonium chloride, cetylpyridinium chloride, poloxamer 188, poloxamer 407, polyoxyl 40 stearate, polysorbate 20, and polysorbate 40), antioxidants (e.g., ascorbic acid, acetylcysteine, butylated hydroxyanisole (BHA), dibutylhydroxytoluene (BHT), cysteine hydrochloride, dithiothreitol, propyl gallate, sodium metabisulfite, and thiourea), and the like that would be suitable for a specific desired dosage form. Remington's Pharmaceutical Sciences, Edited by Gennaro, Mack Publishing, Easton, Pa., 1995 discloses various carriers used in known technologies for formulation of pharmaceutical compositions and the preparation thereof.

[0074] In one embodiment, examples of the utilization method of the invention include, but are not limited to, eye drops. Other examples thereof include dosage modes (administration methods and dosage forms) such as eye ointment, intracameral injection, intravitreal injection, impregnation into a sustained release agent, subconjunctival injection, systemic administration (oral administration, intravenous injection, intraperitoneal administration), and the like.

[0075] In another embodiment, EW-7197 or a pharmaceutically acceptable salt thereof, or a solvate thereof can be present in the composition at a concentration of about 0.001% w/v to about 0.5% w/v and preferably about 0.01% w/v to about 0.2% w/v. The effective dose of the medicament of the invention that is effective for treating or preventing a disease state can vary depending on the nature of the specific disease state but can be determined by those skilled in the art with standard clinical technology. Furthermore, an in vitro assay can be used to assist in the identification of the range of optimal dosages as needed. The dosage, although not particularly limited, can be, for example, 0.001, 1, 5, 10, 15, 100, or 1000 mg/kg body weight per dosing or a value within the range of any two of said values. The dosing interval is not particularly limited, but can be, for example, 1 or 2 administrations per 1, 7, 14, 21, or 28 day, or 1 or 2 administrations per day within the range of any two of them. The dosage, number of dosing, dosing interval, dosing period, and dosing method can be appropriately selected depending on the patient's age or body weight, condition, dosing mode, target organ, or the like. For example, the present invention can be used as an eye drop. Further, the medicament of the invention can be injected into the anterior chamber. Further, a therapeutic drug preferably comprises an active ingredient in a therapeutically effective amount, or in an amount effective to exert a desired action. When a therapeutic marker significantly decreases after administration, it can be determined that a therapeutic effect was exerted. An effective dose can be estimated from a dose-response curve obtained from an in vitro or animal model testing system.

[0076] Hereinafter, various aspects of the present invention will be described.

[0077] In one aspect, the present invention is directed to a method for ameliorating, preventing or treating a disease state mediated by transforming growth factor-β (TFG-β) type I receptor (ALK5) of a subject, wherein the method comprises administering an effective amount of EW-7197 (2-fluoro-N-((5-(6-methylpyridin-2-yl)-4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-1H-imidazol-2-yl)methyl)aniline) or a pharmaceutically acceptable salt thereof, or a solvate thereof, wherein the EW-7197 (2-fluoro-N-((5-(6-methylpyridin-2-yl)-4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-1H-imidazol-2-yl)methyl)aniline) is administered in a form of a pharmaceutical composition, which is aqueous solution, and wherein the disease state mediated by ALK5 is selected one from a group of ocular diseases, postsurgical peritoneal adhesions, postsurgical anastomotic strictures, hypertrophic scar, and keloid.

[0078] In an embodiment, the composition is for reducing the accumulation of excess extracellular matrix (ECM) in human by inhibiting a TGF-β signaling pathway, for example, inhibiting the phosphorylation of Smad2 or Smad3 by ALK5.

[0079] In an embodiment, the ocular disease is selected one from a group of glaucoma, glaucoma filtration surgery bleb failure, intraocular pressure, cataract, posterior capsule opacification (PCO; secondary cataract), corneal haze, wet age-related macular degeneration (AMD), proliferative vitreoretinopathy (PVR), proliferative diabetic retinopathy (PDR), Fuchs' endothelial corneal dystrophy (FECD), and congenital ectopia lentis (CEL).

[0080] In an embodiment, EW-7197 or a pharmaceutically acceptable salt thereof, or a solvate thereof is in the composition at a concentration of about 0.001% w/v to about 0.5% w/v.

[0081] In an embodiment, EW-7197 or a pharmaceutically acceptable salt thereof, or a solvate thereof is in the composition at a concentration of about 0.01% w/v to about 0.2% w/v.

[0082] In an embodiment, said composition further comprises an ophthalmologically acceptable solvent, diluting agent, liquid vehicle, preservative, stabilizer, solubilizer, viscosity enhancer, penetration enhancer, tonicity agent, gelling agent, buffering agent, wetting agent, and/or antioxidant.

[0083] In an embodiment, said solubilizer is tyloxapol, polysorbate 80, PEG-40 stearate (MYS-40), PEG-60 hydrogenated castor oil (HCO-60), poloxamer, polyethylene glycol (PEG), PEG/tyloxapol, or PEG/poloxamer.

[0084] In an embodiment, the solubilizer is PEG/poloxamer.

[0085] In an embodiment, the poloxamer is poloxamer 188 or poloxamer 407.

[0086] In an embodiment, the PEG is PEG4000.

[0087] In an embodiment, the poloxamer is in the composition at a concentration of about 5% w/v to about 15% w/v based on a total volume of the composition.

[0088] In an embodiment, the PEG is in the composition at a concentration of about 20% w/v to about 30% w/v based on a total volume of the composition.

[0089] In an embodiment, a weight ratio of the poloxamer and the PEG is 1:2 to 3.

[0090] In an embodiment, the composition comprising: EW-7197 (2-fluoro-N-((5-(6-methylpyridin-2-yl)-4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-1H-imidazol-2-yl)methyl)aniline) or a pharmaceutically acceptable salt thereof, or a solvate thereof at a concentration of about 0.08% w/v to about 0.18% w/v based on a total volume of the composition; the poloxamer at a concentration of about 5% w/v to about 15% w/v based on a total volume of the composition; and the PEG at a concentration of about 20% w/v to about 30% w/v based on a total volume of the composition, wherein a weight ratio of the poloxamer and the PEG is 1:2 to 3.

[0091] In an embodiment, composition is an eye drop.

[0092] In one aspect, the present invention is directed to a pharmaceutical composition for ameliorating, preventing or treating a disease state mediated by transforming growth factor-β (TFG-β) type I receptor (ALK5) of a subject, wherein the composition is aqueous solution, Wherein the composition comprises EW-7197 (2-fluoro-N-((5-(6-methylpyridin-2-yl)-4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-1H-imidazol-2-yl)methyl)aniline) or a pharmaceutically acceptable salt thereof, or a solvate thereof at a concentration of about 0.08% w/v to about 0.18% w/v based on a total volume of the composition.

[0093] In an embodiment, the composition comprises a poloxamer at a concentration of about 5% w/v to about 15% w/v based on a total volume of the composition; and a PEG at a concentration of about 20% w/v to about 30% w/v based on a total volume of the composition.

[0094] Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the following examples are provided only for illustration of the present invention, and should not be construed as limiting the scope of the present invention.

EXAMPLES

[0095] Example 1-8 illustrates formulation development of ophthalmic solution.

Example 1. Evaluation of Filter Flush Volume

[0096] About 0.001% EW-7197 solution was prepared, and the filter flush volume using 2 types of filters was evaluated. About 1 mL each of the filtrate was collected, and the EW-7197 content was measured before and after filtration by HPLC. The recovery rate was calculated from the EW-7197 content measured before filtration. The filters used in the operation are shown in Table 2.

TABLE-US-00002 TABLE 2 Filters used for filtration Pore Filter Filtration Filter name Filter material size diameter area GLchromato-disk Olefin type 0.45 μm 25 mm  4 cm.sup.2 25A polymer Millipore Sterivex-HV Polyvinylidene 0.45 μm — 10 cm.sup.2 0.45 μm PVDF Difluoride SVHV010RS (PVDF)

[0097] The recovery rate of EW-7197 at filtration is shown in Table 3. Generally, the amount of drug absorption decreases when the filtration area becomes smaller. However, the analysis results showed that the amount of EW-7197 absorption of the filter with a larger filtration area (Millipore Sterivex-HV 0.45 μm PVDF SVHV010RS) was lower than that of the filter with a smaller filtration area (GLchromato-disk 25A). The recovery rate of the former filter (Millipore Sterivex-HV 0.45 μm PVDF SVHV010RS) reached an equilibrium after flushing 3 mL of EW-7197 solution. Meanwhile, the recovery rate of the latter filter (GLchromato-disk 25A) reached an equilibrium after flushing 5 mL of EW-7197 solution. This was considered due to the difference in filter material. Both filters can be used by flushing 5 mL or more of EW-7197 solution when the concentration of EW-7197 is not less than 0.00085%.

TABLE-US-00003 TABLE 3 EW-7197 Recovery rates at filtration Before Recovery filtration Amount of rate of EW-7197 flush solution EW-7197 conc. (%) Filter name (mL) (%) 0.0008519 GLchromato-disk 25A 0 (Before filtration) 100.0 Filtration area 4 cm.sup.2 0~1 33.5 1~2 85.1 2~3 96.7 3~4 99.3 4~5 100.6 5~6 100.9 6~7 101.4 7~8 101.6 8~9 101.8  9~10 101.9 Millipore Sterivex filter unit 0 (Before filtration) 100.0 SVHV010RS 0~1 55.1 Filtration area 10 cm.sup.2 1~2 98.1 2~3 100.6 3~4 101.2 4~5 101.4 5~6 101.5 6~7 101.4 7~8 101.7 8~9 101.4  9~10 101.3

Example 2. Thermal Stability of EW-7197 in Buffer Solutions

[0098] The thermal stability of EW-7197 was evaluated in the formulations prepared with various pH values, buffers, and stabilizing agents. The formulations used in the thermal stability test are shown in Table 4. After the preparation of each formulation, the formulation was filtered. The filters used in the operation are shown in Table 2. About 3 mL of the filtrate was filled into a glass ampule, and stored in a thermostatic chamber (25° C.).

TABLE-US-00004 TABLE 4 Formulations to test thermastability in buffer solutions Ingredients (g/100 mL).sup.*3 A01 A02 A03 A04 A05 A06 A07 A13 A16 A19 A22 BW-7197 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Sodium 0.2 — — — — — — acetate hydrate Trisodium — 0.2 0.2 — — — — — — — — citrate dihydrate Sodium — — — 0.2 0.2 — — — — — — dihydrogen phosphate dihydrate Boric acid — — — — — 0.9 0.9 0.9 0.9 1 1 Sodium — — — — — 0.1 0.1 — — — — borate (Bolax) Trometamol — — — — — — — 0.1 0.1 — — Disodium — — — — — — — — — — — edetate dihydrate (EDTA) Sodium — — — — — — — — — — — thiosulfate hydrate Sodium q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. hydrate Hydrochloric q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. acid pH 5.5 5.5 6.5 6.5 7.5 6.5 7.5 7.5 8.0 7.5 8.0 Ingredient (g/100 mL).sup.*2 B01 B02 B03 B04 B05 B06 B07 C01 C02 C03 C04 C05 C06 C07 BW-7197 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Sodium 0.2 — — — — — — 0.2 — — — — — — acetate hydrate Trisodium — 0.2 0.2 — — — — — 0.2 0.2 — — — — citrate dihydrate Sodium — — — 0.2 0.2 — — — — — 0.2 0.2 — — dihydrogen phosphate dihydrate Boric acid — — — — — 0.9 0.9 — — — — — 0.9 0.9 Sodium — — — — — 0.1 0.1 — — — — — 0.1 0.1 borate (Bolax) Trometamol — — — — — — — — — — — — — — Disodium 0.01 0.01 0.01 0.01 0.01 0.01 0.01 — — — — — — — edetate dihydrate (EDTA) Sodium — — — — — — — 0.01 0.01 0.01 0.01 0.01 0.01 0.01 thiosulfate hydrate Sodium q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s hydrate Hydrochloric q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s acid pH 5.5 5.5 6.5 6.5 7.5 6.5 7.5 5.5 5.5 6.5 6.5 7.5 6.5 7.5 .sup.*2Each formulation was prepared at the density of 1 g/mL.

[0099] The results are shown in Table 5. The results of the thermal stability test at various pH values are shown in FIG. 1. When the stability was measured with respective buffers, the results were different depending on pH values and the presence of stabilizing agent. Regarding the formulations with no stability agents (Series A), the formulations at low pH values had a slightly higher stability when using the same buffer. However, regarding the boric acid/trometamol formulations (A13 and A16) and the trometamol formulations (A19 and A22), the thermal stability of EW-7197 did not differ by pH values. Among the evaluated formulations, the trometamol formulations (A19 and A22) had the highest thermal stability of EW-7197. Regarding the formulations that contain disodium edetate dihydrate (EDTA) (Series B), the thermal stability of EW-7197 did not improve by the addition of EDTA in most of the formulations. A trend of slight improvement of the thermal stability of EW-7197 was shown in the formulations at pH7.5 (B05 and B07), when compared to the formulations that do not contain EDTA. Regarding the formulations that contains sodium thiosulfate hydrate (sodium thiosulfate) (Series C), the thermal stability of EW-7197 decreased or did not change by the addition of sodium thiosulfate for most of the formulations. Especially, the formulations at low pH values were unstable when using the same buffer. While the stability decreased in many formulations, the thermal stability of EW-7197 improved by the addition of sodium thiosulfate in the formulation that contains sodium citrate at pH6.5 (C03) and the formulation that contain boric acid and sodium borate at pH7.5 (C07). Since sodium thiosulfate is decomposed in acidic solution, it is desirable to use the boric acid and sodium borate buffer at not less than pH7.5.

TABLE-US-00005 TABLE 5 Thermal stability of EW-7197 in buffers (25° C.) Sodium EW-7197 Residual ratio (%) Formulation EDTA thiosulfate Storage conc. (%) 25° C. 25° C. number Buffer solutions conc. (%) conc. (%) container pH of Initial Initial 1.5 months 3 months A01 0.2% Sodium acetate — — GA 5.5 0.0008638 100.0 97.6 91.7 hydrate A02 0.2% Trisodium — — GA 0.0008680 100.0 97.4 91.3 A03 citrate dihydrate — — GA 6.5 0.0008750 100.0 96.1 89.4 A04 0.2% Sodium — — GA 0.0008517 100.0 97.2 90.7 A05 dihydrogen — — GA 7.5 0.0008594 100.0 94.9 89.5 phosphate-dihydrate A06 0.9% Boric acid — — GA 6.5 0.0008537 100.0 97.1 91.0 A07 0.1% Sodium borate — — GA 7.5 0.0008724 100.0 95.4 89.3 A13 0.9% Boric acid — — GA 7.5 0.0008304 100.0 93.2 90.0 A16 0.1% Trometamol — — GA 8.0 0.0008643 100.0 93.9 90.4 A19 0.1% Trometamol — — GA 7.5 0.0008730 100.0 95.2 93.2 A22 — — GA 8.0 0.0008729 100.0 95.2 93.4 B01 0.2% Sodium acetate 0.01 — GA 5.5 0.0008700 100.0 97.5 91.9 hydrate B02 0.2% Trisodium 0.01 — GA 0.0008672 100.0 96.4 91.3 B03 citrate dihydrate 0.01 — GA 6.5 0.0008569 100.0 98.0 91.2 B04 0.2% Sodium 0.01 — GA 0.0008638 100.0 96.8 90.6 B05 dihydrogen 0.01 — GA 7.5 0.0008521 100.0 97.2 90.8 phosphate-dihydrate B06 0.9% Boric acid 0.01 — GA 6.5 0.0008749 100.0 96.3 89.6 B07 0.1% Sodium borate 0.01 — GA 7.5 0.0008720 100.0 96.7 90.3 C01 0.2% Sodium acetate — 0.01 GA 5.5 0.0008612 100.0 94.7 91.0 hydrate C02 0.2% Trisodium — 0.01 GA 0.0008732 100.0 88.8 83.2 C03 citrate dihydrate — 0.01 GA 6.5 0.0008755 100.0 98.0 93.5 C04 0.2% Sodium — 0.01 GA 0.0008628 100.0 88.9 88.4 C05 dihydrogen — 0.01 GA 7.5 0.0008610 100.0 94.5 90.3 phosphate-dihydrate C06 0.9% Boric acid — 0.01 GA 6.5 0.0008689 100.0 94.2 89.2 C07 0.1% Sodium borate — 0.01 GA 7.5 0.0008670 100.0 97.6 93.7

Example 3. Photostability of EW-7197 in Buffer Solutions

[0100] The photostability of EW-7197 was evaluated in the formulations prepared with various pH values, buffers, and stabilizing agent. The formulations used in the photostability test are the same formulations (excluding A13, A16, A19, and A22) used for evaluation of thermal stability shown in Table 4. After preparation, each formulation was filtered. The filters used in the operation were shown in Table 2. About 3 mL of the filtrate was filled in a glass ampule, and illuminated with ultraviolet light of 50 W.Math.h/m.sup.2 and visible light of 300,000 lx.Math.hr by a photostability test chamber. The results are shown in Table 6 and FIG. 2. In the results of the respective buffers, the photostability of EW-7197 increased when the pH value increased. Meanwhile, EDTA and sodium thiosulfate did not have the photostabilizing effect on EW-7197 against the visible and ultraviolet light. Generally, illumination under white fluorescent lighting is about 1000 lx per hour. Based on the above results, it is considered that 1-5% of EW-7197 is decomposed by light when EW-7197 solution is left in a room for a whole day under fluorescent lighting. Therefore, EW-7197 needs to be stored in light shielded conditions.

TABLE-US-00006 TABLE 6 Photostability of EW-7197 in buffers (ultraviolet and visible light) Sodium BW-7197 Residual ratio (%) Formulation EDTA thiosulfate Storage conc. (%) Ultraviolet Visible light number Buffer solutions conc. (%) conc. (%) container pH of Initial Inital 50 W .Math. h/m.sup.2 30000 1× .Math. hr A01 0.2% Sodium acetate — — GA 5.5 0.0008638 100.0 2.8 3.0 hydrate A02 0.2% Trisodium — — GA 0.0008680 100.0 2.3 3.5 A03 citrate dihydrate — — GA 6.5 0.0008750 100.0 6.0 11.2 A04 0.2% Sodium — — GA 0.0008517 100.0 10.1 15.1 A05 dihydrogen — — GA 7.5 0.0008594 100.0 16.8 27.2 phosphate-dihydrate A06 0.9% Boric acid — — GA 6.5 0.0008537 100.0 11.1 27.0 A07 0.1% Sodium borate — — GA 7.5 0.0008724 100.0 18.8 33.6 B01 0.2% Sodium acetate 0.01 — GA 5.5 0.0008700 100.0 2.4 4.4 hydrate B02 0.2% Trisodium 0.01 — GA 0.0008672 100.0 2.2 3.1 B03 citrate dihydrate 0.01 — GA 6.5 0.0008569 100.0 5.3 9.4 B04 0.2% Sodium 0.01 — GA 0.0008638 100.0 6.0 17.6 B05 dihydrogen 0.01 — GA 7.5 0.0008521 100.0 14.1 20.2 phosphate-dihydrate B06 0.9% Boric acid 0.01 — GA 6.5 0.0008749 100.0 10.2 22.4 B07 0.1% Sodium borate 0.01 — GA 7.5 0.0008720 100.0 11.0 35.5 C01 0.2% Sodium acetate — 0.01 GA 5.5 0.0008612 100.0 1.9 3.3 hydrate C02 0.2% Trisodium — 0.01 GA 0.0008732 100.0 1.7 2.9 C03 citrate dihydrate — 0.01 GA 6.5 0.0008755 100.0 4.1 6.4 C04 0.2% Sodium — 0.01 GA 0.0008628 100.0 5.5 15.3 C05 dihydrogen — 0.01 GA 7.5 0.0008610 100.0 12.0 20.9 phosphate-dihydrate C06 0.9% Boric acid — 0.01 GA 6.5 0.0008689 100.0 7.6 24.9 C07 0.1% Sodium borate — 0.01 GA 7.5 0.0008670 100.0 10.4 28.3

Example 4. Exploring for Solubilizing Agents

[0101] As shown in Table 1, the solubility of EW-7197 is significantly low within an acceptable pH range for ophthalmic solution development, various solubilizing agents were evaluated. The formulations used in the evaluation of the solubilization study are shown in Table 7. The buffer solution used in this study was 0.9% boric acid/0.1% sodium borate (pH7.5). Each formulation was prepared at 30 g scale, and after adding EW-7197, the formulations were suspended at 4° C. and 25° C. After confirming that the formulations were suspended at each temperature, each formulation was filtered. The EW-7197 content of the filtrate was measured by HPLC. The filters used in the operation are shown in Table 2.

TABLE-US-00007 TABLE 7 Formulations used in exploring of solubilizing agents Ingredients (g/100 mL).sup.*3 D00 D01 D02 D03 D04 D05 D06 D07 D08 D09 D10 D11 D12 D16 Boric acid 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 Sodium borate (Bolax) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Polysorbate 80 — 0.2 0.5 1 — — — — — — — — — — Tyloxapol — — — — 0.2 0.5 1 — — — — — — — PEG-40 Stearate (MYS-40) — — — — — — — 0.2 0.5 1 — — — — PEG-60 hydrogenated Castor — — — — — — — — — — 0.2 0.5 1 — oil (HCO-60) Benzalkonium chloride (BAK) — — — — — — — — — — — — — 0.01 Sodium hydrate q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. Hydrochloric acid q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. pH 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 Ingredients (g/100 mL).sup.*2 D17 D18 D19 D20 D21 D22 D23 D24 D25 D26 D27 D28 D29 D30 Boric acid 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 Sodium borate (Bolax) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Metolose SM-25 (MC SM-25) 0.5 — — — — — — — — — — — — — Hypromellose 60SH-50 — 0.5 — — — — — — — — — — — — (HPMC 60SH-50) Hypromellose 60SH-4000 — — 0.5 — — — — — — — — — — — (HPMC 60SH-4000) Carmellose sodium (CMC) — — — 0.5 — — — — — — — — — — Povidone K-30 (PVP) — — — — 0.5 — — — — — — — — — Lipidure-PMB (Lipidure) — — — — — 0.5 — — — — — — — — Polyethylene glycol 400 — — — — — — 1 — — — — — — — (PEG400) Polyethylene glycol 4000 — — — — — — — 1 4 10 — — — — (PEG4000) Propylene glycol (PG) — — — — — — — — — — 1 — — — Glycerin — — — — — — — — — — — 1 — — Niacinamide — — — — — — — — — — — — 1 2 Sodium hydrate q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s Hydrochloric acid q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s q.s pH 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 Ingredients (g/100 mL).sup.*2 E00 E08 E09 E10 E11 E12 E13 E14 Boric acid 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 Sodium borate (Bolax) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Tyloxapol — 0.3 0.5 0.5 0.5 1 1 1 Polyethylene glycol 4000 4 4 4 — 4 4 — 4 (PEG4000) Niacinamide 2 2 — 2 2 — 2 2 Sodium hydrate q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. Hydrochloric acid q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. pH 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 .sup.*3Each formulation was prepared at the density of 1 g/mL.

[0102] The evaluation results of the solubility of EW-7197 when solubilizing agents were added are shown in Table 8. The solubility of EW-7197 with respective solubilizing agents is shown in FIG. 3, the solubility of EW-7197 with respective concentrations of surfactants, PEG4000, and niacinamide is shown in FIG. 4, and the solubility of EW-7197 when all of tyloxapol, PEG4000, and niacinamide were used is shown in FIG. 5. Water-soluble polymers did not have solubilizing effect on EW-7197. Among various tonicity agents, only niacinamide has a slight solubilizing effect on EW-7197. As shown in FIG. 4, the evaluation results on various surfactants show that each surfactant has a certain level of solubilizing effect, and the solubility of EW-7197 with respective surfactants was at the same level. When adding 1% of each surfactant, about 0.01% of EW-7197 was dissolved at 4° C. and about 0.02% was dissolved at 25° C. As shown in FIG. 5, when tyloxapol was used with PEG4000 and niacinamide, the solubility of EW-7197 at 4° C. and 25° C. was about 1.5 times higher than the solubility when tyloxapol was used solely. Therefore, when developing a formulation with 1% tyloxapol, 4% PEG4000, and 2% niacinamide, the upper limit of concentration of EW-7197 is considered to be about 0.015%.

TABLE-US-00008 TABLE 8 Solubility with various solubilizing agents (4° C. and 25° C.) 4° C. 25° C. Solubilizing EW-7197 EW-7197 Formulation agent Solubilizing solubility solubility number conc. (%) agents pH (%) (%) D00 — 7.5 0.0007277 0.0017161 D16 0.01 BAK 7.5 0.0006589 0.0018652 D17 0.5 MC SM-25 7.5 0.0014722 0.0027500 D18 0.5 HPMC 7.5 0.0009430 0.0026433 60SH-50 D19 0.5 HPMC 7.5 0.0010892 0.0029175 60SH-4000 D20 0.5 CMC 7.5 0.0007288 0.0017653 D21 0.5 PVP 7.5 0.0007750 0.0022091 D22 0.5 Lipidure 7.5 0.0011309 0.0030467 D23 1 PEG400 7.5 0.0007844 0.0021288 D24 1 PEG4000 7.5 0.0008102 0.0020978 D25 4 PEG4000 7.5 0.0012900 0.0035989 D26 10 PEG4000 7.5 0.0023204 0.0071584 D27 1 PG 7.5 0.0006895 0.0017944 D28 1 Glycerin 7.5 0.0006457 0.0017234 D29 1 Niacinamide 7.5 0.0014587 0.0032068 D30 2 Niacinamide 7.5 0.0025646 0.0056196 E00 4 PEG4000 7.5 0.0037331 0.0089662 2 Niacinamide 7.5 D01 0.2 Polysorbate 7.5 0.0027827 0.0055695 80 D02 0.5 Polysorbate 7.5 0.0059988 0.0117987 80 D03 1 Polysorbate 7.5 0.0114852 0.0218575 80 D04 0.2 Tyloxapol 7.5 0.0025618 0.0054409 D05 0.5 Tyloxapol 7.5 0.0054477 0.0111277 D06 1 Tyloxapol 7.5 0.0103369 0.0206627 E01 0.3 Tyloxapol 7.5 0.0073965 0.0148636 4 PEG4000 7.5 2 Niacinamide 7.5 E02 0.5 Tyloxapol 7.5 0.0068873 0.0130107 4 PEG4000 7.5 E03 0.5 Tyloxapol 7.5 0.0084560 0.0161941 2 Niacinamide 7.5 E04 0.5 Tyloxapol 7.5 0.0092463 0.0188141 4 PEG4000 7.5 2 Niacinamide 7.5 E05 1 Tyloxapol 7.5 0.0116266 0.0225032 4 PEG4000 7.5 E06 1% Tyloxapol 7.5 0.0148310 0.0271268 2% Niacinamide 7.5 E07 1% Tyloxapol 7.5 0.0161264 0.0303901 4% PEG4000 7.5 2% Niacinamide 7.5 D07 0.2 MYS-40 7.5 0.0027652 0.0052257 D08 0.5 MYS-40 7.5 0.0059463 0.0106046 D09 1 MYS-40 7.5 0.0115629 0.0200239 D10 0.2 HCO-60 7.5 0.0028038 0.0055497 D11 0.5 HCO-60 7.5 0.0051621 0.0106829 D12 1 HCO-60 7.5 0.0099208 0.0201615

Example 5. Thermal Stability of EW-7197 in Formulations Containing Various Surfactants

[0103] The thermal stability of EW-7197 in the formulations containing various surfactants (tyloxapol, polysorbate 80, PEG-40 stearate (MYS-40), PEG-60 hydrogenated castor oil (HCO-60)) was evaluated as shown in Table 9. In addition, dibutylhydroxytoluene (BHT) was added to the formulations each to evaluate the effect of BHT on the thermal stability of EW-7197. After the preparation of each formulation, the formulation was filtered. The filters used in the operation are shown in Table 2. The filtrate was filled into a glass ampule, and stored in a thermostat bath (40° C.).

TABLE-US-00009 TABLE 9 Formulations with various surfactants for thermal stability test Ingredient (g/100 mL).sup.*4 F01 F02 F12 F22 F23 F24 F25 F26 F27 F28 F29 F30 EW-7197 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Boric acid 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 Sodium borate (Bolax) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Polysorbate 80 — — — 0.5 1 1 — — — — — — Tyloxapol 0.5 1 1 — — — — — — — — — PEG-40 Stearate (MYS-40) — — — — — — 0.5 1 1 — — — PEG-60 hydrogenated Castor — — — — — — — — — 0.5 1 1 oil (HCO-60) Dibutyl hydroxyl toluene — — 0.005 — — 0.005 — — 0.005 — — 0.005 (BHT) Sodium hydrate q.s q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. Hydrochloric acid q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s q.s. q.s. q.s q.s. pH 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 .sup.*4Each formulation was prepared at the density of 1 g/mL.

[0104] The results are shown in Table 10 and FIG. 6. Among 4 types of surfactants, tyloxapol and MYS-40 showed the equivalent results with the highest thermal stability. HCO-60 and polysorbate 80 were low in thermal stability, especially low for polysorbate 80. The thermal stability of tyloxapol and MYS-40 increased as their concentrations increased. Regarding the 3 types of surfactants, except for polysorbate 80, the addition of BHT caused a decrease of the thermal stability of EW-7197. Meanwhile, the addition of BHT significantly improved the thermal stability of EW-7197 in polysorbate 80, but the stability of EW-7197 was still lower than the formulations of tyloxapol and MYS-40 that did not contain BHT. Based on the above, among the 4 types of surfactants, either tyloxapol or MYS-40 was considered the best to be used as a solubilizing agent.

TABLE-US-00010 TABLE 10 Thermal stability with various surfactants (40° C.) Residual ratio (%) Formulation Surfactant BHT EW-7197 40° C. 40° C. 40° C. number Conc. (%) Name Conc. (%) pH Conc. (%) Initial 1 weeks 1 month 2 months F01 0.5 Tyloxapol — 7.5 0.01 100.0 92.9 88.5 81.1 F02 1 — 7.5 0.01 100.0 94.5 90.3 85.1 F12 1 0.005 7.5 0.01 100.0 88.8 80.1 65.4 F22 0.5 Polysorbate80 — 7.5 0.01 100.0 80.5 77.3 68.7 F23 1 — 7.5 0.01 100.0 55.9 53.7 48.3 F24 1 0.005 7.5 0.01 100.0 94.0 88.3 71.3 F25 0.5 MYS-40 — 7.5 0.01 100.0 93.7 88.3 80.0 F26 1 — 7.5 0.01 100.0 92.5 89.3 83.5 F27 1 0.005 7.5 0.01 100.0 95.3 89.0 75.5 F28 0.5 HCO-60 — 7.5 0.01 100.0 87.7 80.4 75.1 F29 1 — 7.5 0.01 100.0 83.2 80.2 72.9 F30 1 0.005 7.5 0.01 100.0 87.7 80.7 60.5

Example 6. Thermal Stability of EW-7197 in Formulations Containing Various Stabilizing Agents

[0105] The thermal stability of EW-7197 in the formulations solubilized with tyloxapol (hereinafter, referred to as the tyloxapol formulations) containing various stabilizing agents was evaluated as shown in Table 11. After the preparation of each formulation, the formulation was filtered. The filters used in the operation are shown in Table 2. For F02, F03, F12, F05, F09, F10 and F11, each filtrate was filled into a glass ampule, and stored in a thermostat bath (40° C.). For F02 and F03, each filtrate was filled into glass ampules and polyethylene ophthalmic bottles (PE bottles), and stored in a thermostatic chamber (40° C.). For F120 and F125, each filtrate was filled into a PE bottle only, and stored in thermostatic chambers (25° C. and 40° C.).

TABLE-US-00011 TABLE 11 Thermal stability test formulations with various stabilizing agents Ingredient (g/100 mL).sup.*5 F02 F03 F12 F05 F09 F10 F11 F120 F128 EW-7197 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.015 0.015 Boric acid 0.9 0.9 0.9 0.9 0.9 0.9 0.9 1.6 1.6 Sodium borate (Bolax) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.3 0.3 Tyloxapol 1 1 1 1 1 1 1 1 1 Disodium edetate — 0.01 — — — — — 0.01 0.01 dihydrate (EDTA) Dibutyl hydroxyl toluene — — 0.005 — — — — — — (BHT) Mannitol — — — 0.1 — — — — — Polyethylene glycol 4000 — — — — 4 — — — — (PEG400) Niacinamide — — — — — 2 — — — Hypromellose 60SH-4000 — — — — — — 0.02 — — (HPMC 60SH-4000) Sodium thiosulfate hydrate — — — — — — — — 0.1 Sodium hydrate q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. Hydrochloric acid q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. pH 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 .sup.*5Each formulation was prepared at the density of 1 g/mL.

[0106] The results are shown in Table 12 and FIG. 7. The thermal stability of EW-7197 in the tyloxapol formulations decreased significantly by addition of BHT. Other stabilizing agents did not affect the thermal stability of EW-7197. When the thermal stability of EW-7197 in the formulation that does not contain stabilizing agent (F02) and the formulation that contains EDTA (F03) using both glass ampules and PE ophthalmic bottles was evaluated, the thermal stability was not improved by EDTA in these containers. However, although no difference was seen in the residual ratio of EW-7197, it was found that the production of degradation products was restrained by addition of EDTA. The HPLC chromatograms for the formulation that does not contain stabilizing agent (F02) and the formulation that contains EDTA (F03) are shown in FIG. 8. Then, the thermal stability of EW-7197 in the tyloxapol formulations that contain EDTA and sodium thiosulfate was evaluated using PE ophthalmic bottles as containers. The results are shown in Table 13 and FIG. 9. Although both of the formulations F120 and F125 contain EDTA, the thermal stability of EW-7197 was improved significantly in the formulation F125 which contains both EDTA and sodium thiosulfate. The residual ratio of EW-7197 in the formulation that contains sodium thiosulfate (F125) was 97.5% when stored for 6 months at 25° C., which was higher than 95.3%, the residual ratio of EW-7197 in the formulation that did not contain sodium thiosulfate (F120). Based on the above, sodium thiosulfate is effective for improving the thermal stability of EW-7197, and an estimated shelf-life of the formulation that contains sodium thiosulfate (F125) is expected to be 1.5 to 2 years at room temperature.

TABLE-US-00012 TABLE 12 Thermal stability with various stabilizing agents (40° C.) Residual ratio (%) Formulation Stabilizing agent Storage EW-7197 40° C. 40° C. 40° C. number Conc. (%) Name container pH Conc. (%) Initial 2 weeks 1 month 2 months F02 — — GA 7.5 0.01 100.0 94.5 90.3 85.1 PE 7.5 0.01 100.0 96.9 92.4 86.6 F03 0.01 EDTA GA 7.5 0.01 100.0 94.3 91.2 84.7 PE 7.5 0.01 100.0 97.8 92.7 88.0 F12 0.005 BHT GA 7.5 0.01 100.0 88.8 80.1 65.4 F05 0.1 Mannitol GA 7.5 0.01 100.0 93.8 91.2 84.2 F09 4 PEG4000 GA 7.5 0.01 100.0 92.3 90.6 83.5 F10 2 Niacinamide GA 7.5 0.01 100.0 93.0 89.7 82.4 F11 0.02 HPMC 60SH-4000 GA 7.5 0.01 100.0 94.1 91.5 84.8

TABLE-US-00013 TABLE 13 Thermal stability of formulations with sodium thiosulfate (25° C. and 40° C.) Residual ratio (%) Formulation Stabilizing agent Storage EW-7197 25° C. 25° C. 40° C. 40° C. number Conc. (%) Name container pH Conc. (%) Initial 1 month 6 months 1 month 2 months F120 0.01 EDTA PE 7.5 0.015 100.0 99.3 95.3 93.1 87.0 F125 0.01 EDTA PE 7.5 0.015 100.0 99.1 97.5 95.8 92.3 0.1 Sodium thiosulfate

Example 7. Thermal Stability of EW-7197 in Formulations with Various Buffers and pH Values

[0107] The thermal stability of EW-7197 in the tyloxapol formulations (containing niacinamide and PEG 4000) prepared by adding various buffers such as boric acid plus sodium borate, trometamol, boric acid plus trometamol, and sodium citrate was evaluated using PE ophthalmic bottles as containers as shown in Table 14. After the preparation of each formulation, the formulations were filtered. The filters used in the operation are shown in Table 2. The filtrate was filled into PE bottles, and stored in a thermostatic chamber (40° C.).

TABLE-US-00014 TABLE 14 Thermal stability test formulations with buffers and at various pH values Ingredient (g/100 mL).sup.*6 F46 F92 F62 F94 F96 F88 EW-7197 0.015 0.015 0.015 0.015 0.015 0.015 Boric acid 0.9 — — 0.8 0.8 — Sodium borate (Bolax) 0.1 — — — — — Trometamol — 1 1 0.8 0.8 — Trisodium citrate dihydrate — — — — — 0.2 Tyloxapol 1 1 1 1 1 1 Disodium edetate dihydrate 0.01 0.01 0.01 0.01 0.01 0.01 (EDTA) Polyethylene glycol 4000 4 4 4 4 4 4 (PEG4000) Niacinamide 2 2 2 2 2 2 Sodium hydrate q.s. q.s. q.s. q.s. q.s. q.s. Hydrochloric acid q.s. q.s. q.s. q.s. q.s. q.s. pH 7.5 7.5 8.0 7.5 8.0 6.5 .sup.*6Each formulation was prepared at the density of 1 g/mL.

[0108] The results are shown in Table 15 and FIG. 10. The thermal stability of EW-7197 was higher in the formulations with trometamol, with boric acid, trometamol, and sodium citrate, compared to that in the formulation with boric acid plus sodium borate at pH7.5 (F46). In addition, in comparison of the formulation with trometamol at pH7.5 (F92) and the formulation with trometamol at pH8.0 (F62), the thermal stability of EW-7197 was higher in the formulation F62. The residual ratio of EW-7197 in the formulation F62 was 88.7% after stored for 2 months at 40° C. Based on the above, it was found that the most suitable buffer was trometamol for the formulation development of EW-7197 from the view point of thermal stability. Considering the expected preservation effect of boric acid from the view point of preservation of EW-7197, boric acid was included in the following experiment.

TABLE-US-00015 TABLE 15 Thermal stability in various buffers (40° C.) Residual ratio (%) Formulation Buffering agent Storage EW-7197 40° C. 40° C. 40° C. number Conc. (%) Name container pH Conc. (%) Initial 2 weeks 1 month 2 months F46 0.9 Boric acid PE 7.5 0.015 100.0 97.1 91.1 85.2 0.1 Sodium borate F92 1 Trometamol PE 7.5 0.015 100.0 95.2 93.9 86.3 F62 1 Trometamol PE 8.0 0.015 100.0 96.6 91.8 88.7 F94 0.8 Boric acid PE 7.5 0.015 100.0 94.6 92.8 86.2 0.8 Trometamol F96 0.8 Boric acid PE 8.0 0.015 100.0 94.8 92.5 86.5 0.8 Trometamol F88 0.2 Trisodium citrate PE 6.5 0.015 100.0 97.2 93.9 86.5 dihydrate

Example 8. Thermal Stability of EW-7197 in Formulations with Metal Ion

[0109] Taking into account of the effect of trace metal, derived from manufacturing equipment in a plant or derived from excipients, the thermal stability of EW-7197 was evaluated in the formulations shown in Table 16 that contain aluminum or iron. After the preparation of each formulation, the formulation was filtered. The filters used in the operation are shown in Table 2. The filtrate was filled into a PE bottle, and stored in a thermostatic chamber (40° C.).

TABLE-US-00016 TABLE 16 Thermal stability test formulations with metal ion Ingredient (g/100 mL).sup.*7 F45 F46 101 102 104 105 EW-7197 0.015 0.015 0.015 0.015 0.015 0.015 Boric acid 0.9 0.9 0.9 0.9 0.9 0.9 Sodium borate (Bolax) 0.1 0.1 0.1 0.1 0.1 0.1 Tyloxapol 1 1 1 1 1 1 Disodium edetate dihydrate — 0.01 — 0.01 — 0.01 (EDTA) Polyethylene glycol 4000 4 4 4 4 4 4 (PEG4000) Niacinamide 2 2 2 2 2 2 Aluminum.sup.*8 — — 0.01 0.01 — — Iron.sup.*8 — — — — 0.01 0.01 Sodium hydrate q.s. q.s. q.s. q.s. q.s. q.s. Hydrochloric acid q.s. q.s. q.s. q.s. q.s. q.s. pH 7.5 7.5 7.5 7.5 7.5 7.5 .sup.*7Each formulation was prepared at the density of 1 g/mL. .sup.*8Aluminum chloride and iron (II) chloride tetrahydrate were added to prepare the specified concentrations of aluminum and iron, respectively.

[0110] In this study, the final concentration of aluminum ions or iron ions was 100 ppm, and the PE ophthalmic bottles were used as containers. The results are shown in Table 17 and FIG. 11. Regardless of whether EDTA was added or not, neither aluminum ions nor iron ions affected the thermal stability of EW-7197. Based on the above, the trace metal derived from manufacturing equipment in a plant or derived from excipients does not affect the thermal stability of EW-7197.

TABLE-US-00017 TABLE 17 Effect of metal ion on thermal stability (40° C.) Residual ratio (%) Formulation Metal ion EDTA EW-7197 40° C. 40° C. 40° C. number Surfactant Conc. (%) Conc. (%) pH Conc. (%) Initial 2 weeks 1 month 2 months F45 1% Tyloxapol — — 7.5 0.015 100.0 96.5 90.5 83.9 101 1% Tyloxapol 100 ppm Al — 7.5 0.015 100.0 94.6 89.9 83.5 104 1% Tyloxapol 100 ppm Fe — 7.5 0.015 100.0 94.8 91.6 83.6 F46 1% Tyloxapol — 0.01 7.5 0.015 100.0 97.1 91.1 85.2 102 1% Tyloxapol 100 ppm Al 0.01 7.5 0.015 100.0 95.2 91.9 84.5 105 1% Tyloxapol 100 ppm Fe 0.01 7.5 0.015 100.0 97.6 94.0 84.4

Example 9-12 Illustrates Formulation Development of PEG/Poloxamer Formulation

[0111] Since 0.1% EW-7197 ophthalmic solution was not able to be formulated with ingredients of general ophthalmic solutions, the formulation development with the PEG/poloxamer formulations was further investigated.

Example 9. Solubility of EW-7197 in the PEG/Poloxamer Formulations

[0112] The solubility of EW-7197 was evaluated in the PEG/poloxamer formulations at various concentrations as shown in Table 18. Each formulation was prepared at 30 mL scale, and after adding EW-7197, the formulations were stirred at 5° C. and 25° C. After confirming that the formulation was suspended at each temperature, the suspension was filtered. The EW-7197 content of the filtrate was measured by HPLC. The filters used in the operation are shown in Table 2.

TABLE-US-00018 TABLE 18 PEG/poloxamer formulations at various concentrations for solubility Ingredients (g/100 mL) K01 K02 K03 K04 K05 K06 K07 K08 K09 K10 K11 K12 Boric acid 0.9 0.9 9.0 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 Sodium borate (Bolax) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Poloxamer 407 5 5 5 5 10 10 10 10 15 15 15 15 Polyethylene glycol 4000 15 20 25 30 15 20 25 30 15 20 25 30 (PEG4000) Disodium edetate 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 dihydrate (EDTA) Sodium hydrate q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. Hydrochloric acid q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. pH 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5

[0113] The results on solubility are shown in Table 19 and FIG. 12. The solubility of EW-7197 increased depending on the concentration of poloxamer 407. When PEG4000 was added at not less than 20%, the solubility of EW-7197 increased depending on the concentration of PEG4000 at every poloxamer 407 concentration. In the formulations K07, K08, K09, K10, K11, and K12, not less than 0.1% of EW-7197 was dissolved at 5° C. Although poloxamer 407 is an excipient with high safety profile, the concentration of poloxamer 407 should be at the lowest level possible since it is a surfactant. Therefore, a favorable concentration of poloxamer 407 is to be 10%.

TABLE-US-00019 TABLE 19 Solubility of EW-7197 in PEG/poloxamer formulation (5° C. and 25° C.) 5° C. 25° C. Poloxamer EW-7197 EW-7197 Formulation PEG4000 407 Conc. Solubility Solubility number Conc. (%) (%) pH (%) (%) K01 15 5 7.5 0.0182068 0.0853844 K02 20 5 7.5 0.0274570 0.0998315 K03 25 5 7.5 0.0539166 0.1318997 K04 30 5 7.5 0.0947156 0.1583350 K05 15 10 7.5 0.0392543 0.1709374 K06 20 10 7.5 0.0805424 0.1851506 K07 25 10 7.5 0.1246044 0.2341502 K08 30 10 7.5 0.1540096 0.2654020 K09 15 15 7.5 0.1058383 0.2670500 K10 20 15 7.5 0.1474700 0.3018637 K11 25 15 7.5 0.1840174 0.3569663 K12 30 15 7.5 0.2311642 0.4572919

Example 10. Thermal Stability of EW-7197 in PEG/Poloxamer Formulations

[0114] The thermal stability of EW-7197 was evaluated in the PEG/poloxamer formulations at various concentrations, in which EW-7197 was dissolved at 0.003%, 0.01%, 0.03%, and 0.1%, as shown in Table 21. After the preparation of each formulation, the formulations were filtered. The filters used in the operation are shown in Table 20. The filtrate was filled into PE bottles, and stored in a thermostatic chamber (40° C.).

TABLE-US-00020 TABLE 20 Filters used for filtration Filter Pore Filter Filtration Filter name material size diameter area Millipore Sterivex filter PVDP 0.45 μm —  10 cm.sup.2 unit SVHV010RS Whatman GE healtheare FP 30 —  1.2 μm 30 μm 5.7 cm.sup.2 CA-S 1.2 μm Whatman GE healtheare FP 30 —   5 μm 30 μm 5.7 cm.sup.2 CN-S 5 μm

TABLE-US-00021 TABLE 21 Formulations with various concentrations of PEG/poloxamer formulations for thermal stability testing Ingredient (g/100 mL) N01 N02 N03 N04 N05 N06 N07 N08 N09 N10 N11 N12 N13 N14 EW-7197 0.003 0.003 0.003 0.003 0.01 0.01 0.01 0.01 0.03 0.03 0.03 0.03 0.1 0.1 Boric acid 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 Sodium borate (Bolax) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Poloxamer 407 5 10 15 10 5 10 15 10 5 10 15 10 10 15 Polyethylene glycol 4000 10 5 0 25 15 10 5 25 25 15 10 25 25 20 (PEG4000) Sodium hydrate q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. Hydrochloric acid q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. pH 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5

[0115] The results are shown in Table 22. When the concentration of EW-7197 was the same, the thermal stability of EW-7197 was higher in the formulation with higher concentration of poloxamer 407 as shown the results of the formulations that contain poloxamer 407 at 5% (N05), 10% (N06), and 15% (N07) in FIG. 13. In addition, the evaluation results at various concentrations of EW-7197 is described in FIG. 14. When setting the concentration of PEG4000 at 25% and that of poloxamer 407 at 10%, and comparing the thermal stability in the formulations at 4 concentration levels of EW-7197 (0.004%, 0.01%, 0.03%, and 0.1%), the thermal stability decreased as the level of EW-7197 concentration increases. It seems that EW-7197 is stabilized when bound in micelles of poloxamer 407, while it is degraded outside of the micelles by the effects of water molecules, etc. The appearance of each formulation was clear and colorless with no foreign insoluble matters were detected at the start of storage, and no change was observed after the storage. Based on the results on the solubility and thermal stability of EW-7197, 25% PEG4000 and 10% poloxamer 407 was chosen for further investigation as they were capable of dissolving EW-7197 at not more than 0.1% and provided relatively high thermal stability to EW-7197.

TABLE-US-00022 TABLE 22 Thermal stability at various concentrations of PEG/poloxamer formulation (40° C.) Residual ratio (%) Formulation PEG4000 Poloxamer 407 Storage EW-7197 40° C. 40° C. 40° C. 40° C. number Conc. (%) Conc. (%) container pH Conc. (%) Initial 1 month 2 months 3 months 4 months N01 10 5 PE 7.5 0.003 100.0 96.1 92.3 88.8 85.1 N02 5 10 PE 7.5 0.003 100.0 97.4 95.7 92.7 89.7 N03 0 15 PE 7.5 0.003 100.0 97.7 94.0 94.7 92.0 N04 25 10 PE 7.5 0.003 100.0  96.  95.1 92.1 89.5 N05 15 5 PE 7.5 0.01 100.0 94.7 90.8 85.7 82.0 N06 10 10 PE 7.5 0.01 100.0 96.7 94.0  90.  87.6 N07 5 15 PE 7.5 0.01 100.0 97.5 95.6 92.4 96.3? N08 25 10 PE 7.5 0.01 100.0 96.4 93.6 90.7 87.8 N09 25 5 PE 7.5 0.03 100.0 94.4 89.8 84.7 80.7 N10 15 10 PE 7.5 0.03 100.0 96.2 92.8 88.8 85.9 N11 10 15 PE 7.5 0.03 100.0 97.3 94.9 90.7 88.5 N12 25 10 PE 7.5 0.03 100.0 96.8 92.8 89.5 86.5 N13 25 10 PE 7.5 0.1 100.0 96.1 92.3 88.6 85.5 N14 20 15 PE 7.5 0.1 100.0 97.6 95.0 91.5 88.8 indicates data missing or illegible when filed

Example 11. Thermal Stability of EW-7197 in PEG/Poloxamer Formulations Containing Various Stabilizing Agents

[0116] The thermal stability of EW-7197 was evaluated in the formulations that contain various stabilizing agents at pH7.5, 8.0 and 8.3 as shown in Table 23. After the preparation of each formulation, the formulations were filtered. The filters used in the operation are shown in Table 20. The filtrate was filled into PE bottles, and stored in a thermostatic chamber (40° C.).

TABLE-US-00023 TABLE 23 Thermal stability test formulations with various stabilizing agents Ingredients (g/100 mL) N36 N08 N38 N37 N16 N17 N40 N23 N42 N41 N24 N25 N22 EW-7197 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Boric acid 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 Sodium borate (Bolax) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Poloxamer 407 10 10 10 10 10 10 10 10 10 10 10 10 10 Polyethylene glycol 4000 25 25 25 25 25 25 25 25 25 25 25 25 25 (PEG4000) Disodium edetate dihydrate — 0.01 — — 0.01 0.01 — 0.01 — — 0.01 0.01 0.01 (EDTA) Dibutyl hydroxyl toluene — — 0.005 — 0.005 — — — 0.005 — 0.005 — — (BHT) Sodium thiosulfate hydrate — — — 0.1 — 0.1 — — — 0.1 — 0.1 — Sodium hydrate q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. Hydrochloric acid q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. q.s. pH 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5

[0117] The results are shown in Table 24. No difference in thermal stability was seen at various pH values in the formulations N36 (pH7.5), N40 (pH8.0), and N22 (pH8.3). Although the thermal stability of EW-7197 was not improved when adding EDTA to the tyloxapol formulations, the thermal stability was improved in both of the PEG/poloxamer formulations N08 (pH7.5) and N23 (pH8.0) that contain EDTA. In addition, the thermal stability was also improved in the formulations N37 (pH7.5) and N41 (pH8.0) that contain sodium thiosulfate. The thermal stability was improved slightly more in the formulations N17 (pH7.5) and N25 (pH8.0) that contain both EDTA and sodium thiosulfate, when compared to the formulations that contain one type of stabilizing agent. The residual ratio of EW-7197 in the formulation N25 was 94.7% after stored for 2 months at 40° C. Meanwhile, for the formulations N38 (pH7.5) and N42 (pH8.0) that contain BHT, no change was observed in thermal stability in the formulation N38, and the thermal stability was improved slightly in the formulation N42. The appearance of each formulation was clear and colorless with no foreign insoluble matters detected at the start of storage, and no change was observed after the storage. Based on the above, we found that the thermal stability of EW-7197 was improved in the PEG/poloxamer formulations containing EDTA or sodium thiosulfate, and the thermal stability was improved further by adding both EDTA and sodium thiosulfate to the formulation. A current estimated shelf-life of the formulation N25 (pH8.0) is 1.5 to 2 years at room temperature.

TABLE-US-00024 TABLE 24 Thermal stability with various stabilizing agents (40° C.) Residual ratio (%) Formulation Stabilizing agent Storage EW-7197 40° C. 40° C. 40° C. 40° C. number Conc. (%) Name container pH Conc. (%) Initial 1 month 2 months 3 months 4 months N36 — — PE 7.5 0.01 100.0 94.4 — — — N08 0.01 EDTA PE 7.5 0.01 100.0 96.4 93.8 90.7 87.8 N38 0.005 BHT PE 7.5 0.01 100.0 94.6 — — — N37 0.1 Sodium thiosulfate PE 7.5 0.01 100.0 97.1 — — — N16 0.01 EDTA PE 7.5 0.01 100.0 96.9 92.7 — — 0.005 BHT N17 0.01 EDTA PE 7.5 0.01 100.0 97.6 94.3 — — 0.1 Sodium thiosulfate N40 — — PE 8.0 0.01 100.0 93.3 — — — N23 0.01 EDTA PE 8.0 0.01 100.0 96.3 92.4 — — N42 0.005 BHT PE 8.0 0.01 100.0 95.  — — — N41 0.1 Sodium thiosulfate PE 8.0 0.01 100.0 96.3 — — — N24 0.01 EDTA PE 8.0 0.01 100.0 96.7 93.0 — — 0.005 BHT N25 0.01 EDTA PE 8.0 0.01 100.0 97.0  94.  — — 0.1 Sodium thiosulfate N22 0.01 EDTA PE 8.3 0.01 100.0 96.8? 92.8 — — indicates data missing or illegible when filed

Example 12. Thermal Stability of EW-7197 in PEG/Poloxamer Formulations Containing Various Viscous Agents

[0118] The thermal stability of EW-7197 was evaluated in the formulations that contain various viscous agents as shown in Table 25. After the preparation of each formulation, the formulation was filtered. The filters used in the operation are shown in Table 20. The filtrate was filled into a PE bottle, and stored in a thermostat bath (40° C.).

TABLE-US-00025 TABLE 25 Thermal stability test formulations with various viscous agents Ingredient (g/100 mL) N29 N30 N31 N32 EW-7197 0.001 0.001 0.001 0.001 Boric acid 0.9 0.9 0.9 0.9 Sodium borate (Bolax) 0.1 0.1 0.1 0.1 Poloxamer 407 10 10 10 10 Polyethylene glycol 4000 25 25 25 25 (PEG4000) Disodium edetate dihydrate 0.01 0.01 0.01 0.01 (EDTA) Xantan gum 0.01 0.01 — — Carmellose sodim CMC) — — 0.1 0.05 Sodium hydrate q.s. q.s. q.s. q.s. Hydrochloric acid q.s. q.s. q.s. q.s. pH 7.5 7.5 7.5 7.5

[0119] The results are shown in Table 26 and FIG. 15. The thermal stability decreased in the formulations that contain xanthan gum or carmellose sodium, when compared to the formulations that did not contain these viscous agents. In addition, the thermal stability decreased depending on the concentration levels of these agents. It seemed that the formulation became unstable because the distribution ratio of EW-7197 out of poloxamer 407 micelle increased by adding water-soluble polymers such as xanthan gum and carmellose sodium. The appearance of each formulation was clear and colorless with no foreign insoluble matters detected at the start of storage, and no change was observed after the storage. Based on the above, when adding water-soluble polymers for the purpose of viscous, it is considered better to add them at the lowest amount possible.

TABLE-US-00026 TABLE 26 Thermal stability with various viscous agents (40° C.) Residual ratios (%) Formulation Viscous agent Storage EW-7197 40° C. 40° C. 40° C. 40° C. number Conc. (%) Name container pH Conc. (%) Initial 1 month 2 months 3 months 4 months N08 — — PE 7.5 0.01 100.0 96.4 93.6 90.7 87.8 N29 0.01 Xanthan gum PE 7.5 0.01 100.0 96.3 92.4 — — N30 0.1 Xanthan gum PE 7.5 0.01 100.0 95.5 91.9 — — N31 0.1 CMC PE 7.5 0.01 100.0 96.2 91.9 — — N32 0.5 CMC PE 7.5 0.01 100.0 90.7 — — indicates data missing or illegible when filed

[0120] In conclusion, the solubility of EW-7197 in the PEG/poloxamer formulations was very high. The solubility of EW-7197 was about 0.125% (5° C.) in formulations containing 25% PEG4000 and 10% poloxamer 407. The thermal stability of EW-7197 in the PEG/poloxamer formulation was greatly affected by the concentration of poloxamer 407. Sodium thiosulfate was effective to improve the stability of EW-7197 in the PEG/poloxamer formulation, as well as in the tyloxapol formulations. Meanwhile, contrarily to its small effect in the tyloxapol formulations, EDTA was also effective to improve the stability of EW-7197 in the PEG/poloxamer formulation. It seemed that viscous agents increased the distribution ratio of EW-7197 out of poloxamer 407 micelles, and the thermal stability of EW-7197 decreased when viscous agents were added. The residual ratio of EW-7197 in the formulation prepared by adding sodium thiosulfate and EDTA to 25% PEG4000/10% poloxamer 407 was 94.7% after stored for 2 months at 40° C. A current estimated shelf-life of the formulation is 1.5 to 2 years at room temperature.

[0121] The effects of the present invention are not limited to those mentioned above. It should be understood that the effects of the present invention include all effects that can be inferred from the description of the present invention.

[0122] The invention has been described in detail with reference to preferred embodiments thereof. However, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.