COMPOSITION OF FUSED TRICYCLIC GAMMA-AMINO ACID DERIVATIVES AND THE PREPARATION THEREOF

Abstract

The present disclosure provides a pharmaceutical composition of fused tricyclic gamma-amino acid derivatives and the use thereof. The pharmaceutical composition includes: (i) a compound having a structure represented by formula (I) or a pharmaceutically acceptable salt thereof, as an active material, in an amount of 1% to 45% by weight; (ii) optionally one or more fillers in an amount of 50% to 95% by weight; (iii) optionally one or more lubricating agents in an amount of 0.1% to 5.5% by weight; and the sum of weight percentages of the all components is 100%, wherein the pharmaceutically acceptable salt of the compound of formula (I) has a structure as follows.

##STR00001##

Claims

1. A pharmaceutical composition comprising: (i) an active material having a structure as represented by formula (I) or a pharmaceutically acceptable salt in an amount of 1% to 45% by weight; (ii) optionally one or more filler in an amount of 50% to 95% by weight; and (iii) optionally one or more lubricating agents in an amount of 0.1% to 5.5% by weight; wherein the sum of weight percentages of all the components is 100%; wherein the structure of formula (I) is as follows. ##STR00027##

2. The composition according to claim 1, wherein the structure of formula (I) is as follows. ##STR00028##

3. The composition according to claim 2, wherein the pharmaceutically acceptable salt of the compound of formula (I) has a structure as follows. ##STR00029##

4. The composition according to claim 1, wherein the active material is included in an amount of 1% to 25% by weight, preferably 5% to 21% by weight.

5. The composition according to claim 1, wherein the filler is one or more selected from mannitol and microcrystalline cellulose.

6. The composition according to claim 5, wherein the filler is selected from a combination of mannitol and microcrystalline cellulose with a content of mannitol of 9% to 35% by weight, preferably 15% to 28% by weight.

7. The composition according to claim 6, wherein the microcrystalline cellulose comprises microcrystalline cellulose A and microcrystalline cellulose B, preferably microcrystalline cellulose 102 and microcrystalline cellulose 12.

8. The composition according to claim 7, wherein the microcrystalline cellulose A is included in an amount of 3% to 58% by weight, preferably 5% to 8% by weight, and the microcrystalline cellulose B is included in an amount of 17% to 72% by weight, preferably 56% to 72% by weight.

9. The composition according to claim 1, wherein the lubricating agent is one or more selected from stearic acid, magnesium stearate, sodium stearyl fumarate and glyceryl behenate, preferably magnesium stearate.

10. The composition according to claim 9, wherein the lubricating agent is included in an amount of 0.5% to 2% by weight, preferably 0.5% to 0.6% by weight.

11. The composition according to claim 1, further comprising, optionally, one or more binders which are selected from hydroxypropyl cellulose or povidone.

12. The composition according to claim 1, further comprising, optionally, one or more disintegrating agents which are selected from croscarmellose sodium and sodium carboxymethyl starch.

13. The composition according to claim 1, further comprising, optionally, one or more glidants which are selected from silica or talc.

14. The composition according to claim 1, which is in a form of capsule or tablet.

15. The composition according to claim 14, comprising: (i) a pharmaceutically acceptable salt of the compound of formula (I), as an active material, which is included in an amount of 5% to 21% by weight; (ii) a filler comprising mannitol, microcrystalline cellulose A and microcrystalline cellulose B, wherein mannitol is included in an amount of 15% to 28% by weight, the microcrystalline cellulose A is included in an amount of 5% to 8% by weight, and the microcrystalline cellulose B is included in an amount of 56% to 61% by weight; and (iii) magnesium stearate which is included in an amount of 0.5% to 0.6% by weight; wherein the total percentage of all components is 100%; and wherein the pharmaceutically acceptable salt of the compound of formula (I) has a structure as follows. ##STR00030##

16. The composition according to claim 15, further comprising a glidant selected from silica or talc.

17. The composition according to claim 15, further comprising a binder selected from hydroxypropyl cellulose.

18. The composition according to claim 1, wherein the active material is present, in terms of a free base thereof, in an amount of 1 to 100 mg, preferably in an amount of 5 to 20 mg.

19. The composition according to claim 1, wherein the active material is present, in terms of a free base thereof, in an amount of 5 or 20 mg.

20. A method for preparing the pharmaceutical composition according to claim 1, comprising: (i) subjecting the active materials to a 60-mesh sieve, and subjecting the filler to a 40-mesh sieve for use; (ii) adding the sieved active substance and filler into a multi-directional movement mixer to be uniformly mixed; (iii) adding a lubricating agent in the multi-directional movement mixer for mixing with the mixture obtained in (ii); and (iv) filling a capsule with the mixture obtained in (iii).

21. A method for preparing the pharmaceutical composition according to claim 1, comprising: (i) subjecting the active materials to a 60-mesh sieve, and subjecting the filler to a 40-mesh sieve for use; (ii) preparing a 40% aqueous ethanol solution as a solvent; (iii) adding the sieved active substance and filler with a binder into a wet granulator, and adding the solvent prepared in (ii) for mixing by shearing to prepare a soft material; (iv) subjecting the soft material to screening to produce particles, and performing static drying or dynamic drying on fluidized bed; (v) granulating the dried soft material, and then adding it with a glidant and a disintegrating agent in a multi-directional movement mixer for uniform mixing; (vi) adding a lubricating agent in the multi-directional movement mixer for mixing; and (vii) filling a capsule with the mixture obtained in (vi); or alternatively, the steps (ii) and (iii) may be replaced by: (ii-1) formulating a binder and a 40% aqueous ethanol solution into a binder solution; (iii-1) adding the active material and filler into a wet granulator, and adding the binder solution prepared in (ii-1) for mixing by shearing to prepare a soft material.

22. A method for preparing the pharmaceutical composition according to claim 1, comprising: (i) subjecting the active materials to a 100-mesh sieve, and subjecting a filler and a disintegrating agent to a 60-mesh sieve; (ii) adding the sieved active material, filler and disintegrating agent into a high-speed wet granulator for uniform mixing; (iii) adding a binder solvent into the mixed powder as obtained in (ii) to prepare a soft material; (iv) subjecting the soft material to a 20-mesh sieve for producing particles, then performing static drying or dynamic drying on fluidized bed to adjust the moisture content to be less than 2%; (v) subjecting the dried particles to a 24-mesh sieve for granulating, adding the granules with a lubricating agent into a multi-directional movement mixer for uniform mixing; (vi) press-molding the mixture as obtained in step (v) into tablets. alternatively, the steps (iii) and (iv) may be replaced by: (iii-1) adding the mixed powder as obtained in step (ii) to a fluidized bed, pumping the binder solution into the fluidized bed with a peristaltic pump, and producing particles by top spray.

23. A method for the treating and/or preventing pain, comprising administering an effective dose of a compound of formula (I), wherein the effective dose is 1 to 100 mg, preferably 5 to 20 mg.

24. The method according to claim 23, wherein the pain includes: postherpetic neuralgia, trigeminal neuralgia, migraine, pain associated with osteoarthritis or joint rheumatism, lower back pain, sciatica, dental pain, pain caused by burns, pain caused by diabetic neuropathy, pain caused by chemotherapy-induced neuropathy, HIV-associated neuralgia, AIDS-associated neuralgia, cancer-associated neuralgia or non-neuropathic pain, acute or chronic tension headache, postoperative pain or fibromyalgia; preferably postherpetic neuralgia, pain caused by diabetic neuropathy or fibromyalgia.

25. The method according to claim 23, wherein the administration route is oral administration.

26. (canceled)

27. (canceled)

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0148] FIG. 1 is a graph showing the effect of the Compound 1 on the mechanical pain threshold value in L5-L6 spinal nerve ligation animal model;

[0149] FIG. 2 is graph showing the effect on the mechanical pain threshold value after single-dose of Compound 1 is administrated to CCI modeling rat (X±s, n=10);

[0150] FIG. 3 is graph showing the effect on the mechanical pain threshold value after single-dose of Pregabalin is administrated to CCI modeling rat (X±s, n=10);

[0151] FIG. 4 is graph showing the XRD of Compound 1;

[0152] FIG. 5 is graph showing the TGA/DSC of Compound 1; and

[0153] FIG. 6 is a diagram depicting the single-crystal diffraction spectrum of Compound 1.

DETAILED DESCRIPTION OF THE DISCLOSURE

[0154] The technical solution of the disclosure is described in detail below in conjunction with drawings and examples in the following, which is, however, merely included in the protection scope of the present disclosure includes without limitation.

[0155] The structure of a compound was determined by nuclear magnetic resonance (NMR) and/or mass spectrometry (MS). The NMR shift (δ) was given in 10.sup.−6 ppm. NMR was determined using a nuclear magnetic resonance instrument (Bruker Avance III 400 and Bruker Avance 300) with deuterated dimethyl sulfoxide (DMSO-d6), deuterated chloroform (CDCl.sub.3) or deuterated methanol (CD.sub.3OD) as a solvent, and tetramethylsilane (TMS) as an internal standard.

[0156] The MS measurement was conducted by Agilent 6120 B (ESI) and Agilent 6120 B (APCI).

[0157] The HPLC measurement was conducted by Agilent 1260 DAD high-pressure liquid chromatograph (ZorbaxSB-C 18 100×4.6 mm).

[0158] The known starting materials in the present disclosure may be synthesized by using or according to methods known in the art, or may be commercially available from companies such as Titan Technologies, Anaji Chemistry, Shanghai Demer, Chengdu Kelong Chemical, Shaoyuan Chemical Technology, Bailingwei Technology, etc. The microcrystalline cellulose represents microcrystalline cellulose 102, if it is not otherwise specified.

Intermediate 1: The Preparation of Intermediate 1j

[0159] ##STR00013##

Step 1: (±) (1S, 5R, 7S)-7-(2-bromoethyl)bicyclic [3.2.0] Hept-2-ene-6-one (1b)

[0160] ##STR00014##

[0161] A starting material 1a (24 g, 0.36 mol) and 1100 mL of cyclohexane were added into a reaction flask protected with nitrogen, and triethylamine (25 g, 0.25 mol) was added thereinto, and heated to reflux. A solution of 4-bromobutanoyl chloride (46 g, 0.25 mol) in cyclohexane was added dropwise with a syringe pump (100 mL, 25 ml/h), thereafter a reflux reaction was carried out for 4 hours. The reaction solution was suction filtered, washed with cyclohexane (150 mL×3), and the filtrates were combined, washed with saturated ammonium chloride (1000 mL×2) and water (1000 mL×2), dried over anhydrous sodium sulfate, filtered, concentrated under reduced pressure, and purified by silica gel column chromatography (petroleum ether/ethyl acetate (v/v)=80:1) to give a light yellow oily product 1b (9.6 g, yield 18%). .sup.1H NMR (400 MHz, CDCl.sub.3) δ 5.97-5.85 (m, 1H), 5.80-5.70 (m, 1H), 3.91-3.79 (m, 1H), 3.67 (dd, J=9.7, 5.5 Hz, 2H), 3.47 (t, J=6.8 Hz, 2H), 2.68 (ddd, J=18.3, 15.2, 3.9 Hz, 1H), 2.47-2.31 (m, 1H), 2.13 (dq, J=21.0, 6.5 Hz, 1H), 1.93 (ddd, J=21.5, 12.2, 7.1 Hz, 1H)

Step 2: (±) (1S, 5R, 7S)-7-(2-bromoethyl) Spiro[bicyclic [3.2.0] Hept-[2]-ene-6, 2′-[1, 3] Dioxolane] (1c)

[0162] ##STR00015##

[0163] The compound 1b (23 g, 0.11 mol), p-toluenesulfonic acid monohydrate (1.0 g, 5.5 mmol), and ethylene glycol (27.3 g, 0.44 mol) were taken into a single-necked flask, added with 250 mL of toluene, and heated for refluxing and water separation for 6 h. Upon cooling, the reaction solution was poured into ice water, added with sodium bicarbonate to adjust the pH value to neutral, and extracted with ethyl acetate (300 mL×3). The organic phases were combined, dried with anhydrous sodium sulfate, filtered, concentrated, and purified by column chromatography (ethyl acetate:petroleum ether=1:30) to obtain a yellow oily product 1c (21.2 g, yield 75%). .sup.1H NMR (400 MHz, CDCl.sub.3) δ 5.94-5.83 (m, 1H), 5.67-5.56 (m, 1H), 3.95-3.75 (m, 4H), 3.36-3.25 (m, 2H), 3.23-3.12 (m, 1H), 3.02 (ddd, J=22.9, 15.7, 8.0 Hz, 2H), 2.48-2.25 (m, 2H), 1.99-1.78 (m, 2H).

Step 3: (±) (1S, 5R, 7S)-7-(2-bromoethyl) Spiro[bicyclic [3.2.0] Hept-[2]-ene-6,2′-[1, 3] Dioxolane]-2-ol (1d)

[0164] ##STR00016##

[0165] The starting material 1c (15 g, 0.06 mol) was added into a reaction flask, added with tetrahydrofuran (250 ml) as a solvent, and added dropwise with a borane dimethyl sulfide solution (30 ml, 0.3 mol) in an ice-water bath. Then, the resultant was left stand at the temperature for 2 hours, added dropwise with a purified water (0.6 mol) in the ice-water bath, then added dropwise with a sodium hydroxide aqueous solution (3 mol/1,200 ml), then added dropwise with hydrogen peroxide (containing 0.6 mol of H.sub.2O.sub.2). Then it is heated to room temperature to react for 3 hours. Thereafter, it is extracted with ethyl acetate (200 mL×3), and the organic phases were combined, washed with water (300 mL×2), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give a pale yellow oily product 1d (16.5 g), which was used in the next step without purification.

Step 4: (±) (1S, 5R, 7S)-7-(2-bromoethyl) Spiro[bicyclic [3.2.0] Hept-[2]-ene-6, 2′-[1,3] Dioxolane]-2-one (1e)

[0166] ##STR00017##

[0167] The compound 1d (16.5 g, 0.06 mol) and dichloromethane (250 mL) were added to a reaction flask, and added with a Dess-Martin oxidant (38.2 g, 0.09 mol) in batch manner in an ice bath, and reacted at room temperature for 2 hours. A saturated sodium bicarbonate solution was added dropwise to the reaction solution until the pH was about 7. The resultant was subjected for liquid separation, and the aqueous phase was extracted with dichloromethane (200 mL×2), while the organic phases were combined, washed with water (500 mL×1), dried over anhydrous sodium sulfate, filtered, concentrated under reduced pressure, and purified by silica gel column chromatography (petroleum ether/ethyl acetate (v/v)=8:1) to give a light yellow oily product 1e (9.7 g, yield 59%). .sup.1H NMR (400 MHz, CDCl.sub.3) δ 4.02-3.81 (m, 4H), 3.40 (dd, J=10.3, 3.8 Hz, 2H), 3.15 (td, J=10.3, 4.9 Hz, 2H), 2.61 (ddd, J=20.6, 14.0, 8.1 Hz, 2H), 2.27 (ddt, J=18.9, 9.6, 1.8 Hz, 1H), 2.12-2.00 (m, 1H), 1.99-1.70 (m, 3H).

Step 5: (±) (1′R, 3'S, 6'S)-spiro[[1,3]dioxolane-2,2′-tricyclic[4.2.1.0.SUP.3,8.] Nonane] -7′-one (1f)

[0168] ##STR00018##

[0169] Potassium tert-butoxide (16 g, 0.14 mol) and tetrahydrofuran (1 L) were added to a reaction flask under protection of nitrogen. The resultant was cooled to −0° C., added dropwise with the compound 1e in toluene (29 g, 0.11 mol), and then stirred at room temperature for 2 hours. A saturated ammonium chloride solution was added dropwise in an ice bath until the pH was about 7, extracted with ethyl acetate (500 mL×2), washed with water (1000 mL×2), dried over anhydrous sodium sulfate, filtered, concentrated under reduced pressure, and purified by silica gel column chromatography (petroleum ether/ethyl acetate (v/v)=10:1) to give a pale yellow oily product 1f (9.5 g, yield 45%). .sup.1H NMR (400 MHz, CDCl.sub.3) δ 4.04-3.86 (m, 4H), 3.20-3.07 (m, 1H), 2.99-2.86 (m, 1H), 2.53 (ddd, J=8.6, 5.6, 1.7 Hz, 1H), 2.41-2.24 (m, 2H), 2.24-2.01 (m, 2H), 1.95 (d, J=13.2 Hz, 1H), 1.61 (dddd, J=14.4, 7.6, 2.6, 0.7 Hz, 1H), 1.51-1.38 (m, 1H).

Step 6: (±) (1′R, 3'S, 6'S)-spiro[[1,3] Dioxolane-2,2′-tricyclic [4.2.1.0.SUP.3,8.] Nonane] (1g)

[0170] ##STR00019##

[0171] The starting material 1f (9.0 g, 46.3 mmol) and diethylene glycol (150 mL) were added into a reaction flask, added with hydrazine hydrate (8.9 g, 278 mmol) and potassium hydroxide (15.6 g, 278 mmol). The resultant was reacted at 180° C. for 3 hours, followed by a rotary evaporation under reduced pressure for water removal at 70° C., then warmed to 220° C. and reacted for 2 hours, and cooled. The resulting reaction solution was added with water (200 mL), extracted with methyl tert-butyl ether (300 mL×3), washed with 1 mol/1 hydrochloric acid (400 mL×2), washed with water (400 mL×2), dried with anhydrous sodium sulfate, filtered, concentrated under reduced pressure and purified by silica gel column chromatography (petroleum ether/ethyl acetate (v/v)=60:1) to give a colorless oily product 1g (3 g), which was used in the next step without purification.

Step 7: (±) (1R, 3S, 6R, 8R)-tricyclic [4.2.1.0.SUP.3,8.] Nonane-2-one (1h)

[0172] ##STR00020##

[0173] The starting material 1g (3 g, 16.6 mmol) was added to a reaction flask, then added with tetrahydrofuran (36 ml) and water (12 ml) as solvents, and added dropwise with trifluoroacetic acid (8 ml) in an ice bath, and reacted at 45° C. for 3 hours. The resultant was added dropwise with a saturated sodium bicarbonate solution in an ice bath until the pH was about 7, then extracted with ethyl acetate (80 mL×3), washed with water (100 mL×2), dried over anhydrous sodium sulfate, filtered, concentrated under reduced pressure, and purified by silica gel column chromatography (petroleum ether/ethyl acetate (v/v)=100:1) to give a white solid product 1h (2 g, yield 88%). .sup.1H NMR (400 MHz, CDCl.sub.3) δ 3.47-3.33 (m, 1H), 3.19 (dd, J=3.3, 1.8 Hz, 1H), 2.84-2.69 (m, 1H), 2.47-2.32 (m, 1H), 2.12-1.97 (m, 1H), 1.93 (d, J=12.3 Hz, 1H), 1.82-1.69 (m, 1H), 1.56-1.35 (m, 4H), 1.27-1.10 (m, 1H).

Step 8: (±) Ethyl 2-((1R, 3S, 6R, 8R)-tricyclic [4.2.1.0.SUP.3,8.] Non-2-ylidene) Acetate (1i)

[0174] ##STR00021##

[0175] Sodium hydride (60%, 91.6 g, 3.82 mol) and tetrahydrofuran (5 L) were added to a reaction flask, cooled to 0° C., and added dropwise with ethyl diethoxyphosphono ethylacetate (856 g, 3.82 mol) in tetrahydrofuran (400 mL). Then, the resultant was left stand at the temperature for 15 minutes, and added dropwise with the compound 1h (400 g, 2.94 mol) in tetrahydrofuran (200 mL), and then heated to room temperature for reaction for 1 hour. The resultant was added with a saturated ammonium chloride dropwise to pH 7-8 in an ice water bath, extracted with ethyl acetate (500 mL×3), washed with saturated brine (500 mL×2), dried over anhydrous sodium sulfate, concentrated under reduced pressure, and purified by silica gel column chromatography (petroleum ether/ethyl acetate (v/v)=30:1) to give a light yellow oily product 1i (310 g, 51% yield).

Step 9: (±) Ethyl 2-((1R, 3S, 6R, 8R)-2-(nitromethyl) Tricyclic [4.2.1.0.SUP.3,8.] non-2-yl) Acetate (1j)

[0176] ##STR00022##

[0177] The starting material 1i (390 g, 1.89 mol), nitromethane (4 L) and 1, 8-diazabicyclo [5.4.0] undec-7-ene (575.6 g, 3.78 mol) were added to a reaction flask and was heated to 80° C. for 9 hours. The reaction liquid was poured into ice water (3000 ml), extracted with DCM (2000 mL×3), washed with brine (3000 ml), dried over anhydrous sodium sulfate, concentrated under reduced pressure, and purified by silica gel column chromatography (petroleum ether/ethyl acetate (v/v)=100:1) to give a colorless oily product 1j (360 g, yield 71%).

[0178] The Preparation of Compound 1:

##STR00023##

[0179] (±) ethyl 2-((1R, 3S, 6R, 8R)-2-(nitromethyl) tricyclic [4.2.1.0.sup.3′.sup.8] non-2-yl) acetate (intermediate 1j) (360 g) was used for resolution under the following condition: using Thar analytical SFC (SFC-A) as an instrument, chiralPak AD, 150×4.6 mm I.D. 3 m as a column, with mobile phases of A for CO.sub.2 and B for Methanol, gradient of B as 5-40%, a flow velocity of 2.4 mL/min, and a column temperature of 35° C. Two optical isomers were obtained after separation: peak 1 (retention time: 3.8 minutes, 174 g) and peak 2 (retention time: 5.7 minutes, 160 g). Compound 1j: [α] 20D=0.00° (C=0.9, CH2Cl2); peak 2: [α] 20D=44° (C=0.103, CH3OH). Here, C refers to the weight (in g) of the substance to be tested per 100 mL of solution, and 20D refers to a test at 20° C., with a sodium light lamp as a light source, at a wavelength of 589 nm.

Step 1: (1'S, 2'S, 3′R, 6'S, 8'S)-spiro[pyrrolidine-3,2′-tricyclic [4.2.1.0.SUP.3,8.] Nonane]-5-one (1k-1)

[0180] ##STR00024##

[0181] The starting material 1j-1 (peak 2, 270 g, 1.01 mol), ethanol (1 L) and water (1 L) were added to a reaction flask, then added with reduced iron powders (282 g, 5.05 mol) and ammonium chloride (162 g, 3.03 mol), and reacted under refluxing for 4 hours. The reaction solution was filtered, and the filtrate was concentrated to remove ethanol, thereafter the remaining solution was added with 500 mL of water, while the filter residue was washed with dichloromethane (200 mL×3). The filtrate was collected, and the organic phase was mixed with the aforesaid remaining solution, subjected to liquid separation, extracted with dichloromethane twice (500 mL×2). The organic phases were combined, washed with water (500 mL×2), dried with sodium sulfate, concentrated under reduced pressure, and purified by silica gel column chromatography (dichloromethane/methanol (v/v)=40: 1-10:1) to obtain a white solid product 1k-1 (160 g, yield 83%).

Step 2: 2-((1S, 2S, 3R, 6S, 8S)-2-(aminomethyl) Tricyclic[4.2.1.0.SUP.3,8.]non-2-yl) Acetic Acid (1l-1)

[0182] ##STR00025##

[0183] The starting material 1k-1 (320 g, 1.673 mol) was added to a reaction flask, then added with 6N hydrochloric acid (1.6 L), and reacted under refluxing for 16h. The precipitated solid was filtered. The obtained solid was dissolved in 1 L of purified water, adjusted with concentrated ammonia water until the pH was about 7, subjected to suction filtration, washed with ice water, and dried to obtain a white solid. The filtrate was adjusted with 10N sodium hydroxide in an ice water bath until the pH was about 6, and further adjusted with concentrated ammonia water until the pH was about 7, and extracted with dichloromethane (1 L×3). The remaining aqueous phase was concentrated and dried, filtered, and washed with ice water to obtain a white solid. The resulting solid as obtained in the two portions was pulped with dichloromethane (1.5 L×3) to give a white solid compound 1l-1 (245 g, 70%).

[0184] The Preparation of Compound 1:

##STR00026##

[0185] The compound 1l-1 (245 g, 1.17 mol) was added into a reaction flask, added with methanol (2.2 L), and added dropwise with benzenesulfonic acid monohydrate (268.0 g, 1.52 mol) in methanol, then stirred for 1 hour at room temperature. The precipitated solid was filtered by suction, and the filtrate was concentrated to obtain a solid. The resulting solid in the two portions was combined and pulped with dichloromethane (1.5 L×3), filtered, washed with ethyl acetate, and dried to obtain a pure compound 1 (398 g, yield 92.5%, HPLC: 9 9%, with a chemical formula of C.sub.12H.sub.19NO.sub.2.C.sub.6H.sub.6O.sub.3S). .sup.1H NMR (400 MHz, D.sub.2O) δ 7.85-7.70 (m, 2H), 7.54 (tt, J=14.3, 7.2 Hz, 3H), 3.33 (d, J=13.8 Hz, 2H), 2.81 (dd, J=13.2, 5.4 Hz, 1H), 2.57 (q, J=17.6 Hz, 2H), 2.47-2.37 (m, 1H), 2.27 (dd, J=12.0, 6.0 Hz, 1H), 2.17-2.06 (m, 1H), 1.96 (dd, J=21.6, 9.5 Hz, 1H), 1.79-1.66 (m, 1H), 1.66-1.40 (m, 4H), 1.33 (dd, J=14.3, 9.0 Hz, 1H), 1.26-1.15 (m, 1H).

[0186] The peak value of compound 1 in the X-ray powder-diffraction pattern (XRD) is shown in the table as below, and specifically shown in FIG. 4.

TABLE-US-00001 Peak Interplanar Relative peak 2θ height FWHM spacing [Å] height [%] 9.7167 4046.64 0.1279 9.10278 33.05 11.1352 1612.11 0.0384 7.94615 13.17 11.2128 1820.68 0.1023 7.89135 14.87 11.8322 277.75 0.1535 7.47961 2.27 14.0077 3132.13 0.0512 6.32246 25.58 14.0962 2255.84 0.064 6.28296 18.43 15.1565 3670.71 0.064 5.84573 29.98 15.3713 1403.94 0.0768 5.76452 11.47 15.6037 1165.35 0.1279 5.67918 9.52 15.9607 443.05 0.0512 5.55295 3.62 16.3325 12242.87 0.1023 5.42737 100 18.2092 900.66 0.1151 4.87203 7.36 18.87 1903.14 0.064 4.70287 15.54 19.0176 2554.83 0.0384 4.66672 20.87 19.3165 5667.72 0.1279 4.59518 46.29 19.8771 4571.39 0.0895 4.46681 37.34 20.3279 1930.15 0.0384 4.36878 15.77 20.4622 3513.85 0.0768 4.3404 28.7 21.1053 859.6 0.0768 4.20958 7.02 21.2599 1641.19 0.0512 4.17932 13.41 21.5253 3785.86 0.0384 4.12837 30.92 21.6885 7208.47 0.1151 4.09769 58.88 22.3935 724.03 0.1535 3.97025 5.91 22.7865 262.87 0.0384 3.90265 2.15 23.4692 1810.44 0.0895 3.79065 14.79 24.1631 54.8 0.1535 3.68334 0.45 25.3274 1659.16 0.0624 3.51369 13.55 25.4027 1478.13 0.0512 3.50635 12.07 25.6773 1433.37 0.0512 3.46946 11.71 25.9344 1421.23 0.0468 3.4328 11.61 25.999 1046.47 0.0468 3.43294 8.55 26.9314 950.92 0.1404 3.30794 7.77 27.3414 296.52 0.1248 3.25927 2.42 27.9554 2439.22 0.0468 3.18906 19.92 28.0286 2418.82 0.0624 3.1809 19.76 28.5766 1038.14 0.078 3.12113 8.48 29.1738 996.82 0.0468 3.05858 8.14 29.8174 1938.81 0.1248 2.99402 15.84 30.6914 348.82 0.0468 2.91071 2.85 31.3063 653.82 0.1248 2.85493 5.34 31.5601 212.27 0.0936 2.83255 1.73 32.3291 96.39 0.1872 2.76691 0.79 33.0473 214.64 0.1872 2.7084 1.75 34.2421 109.66 0.1248 2.61658 0.9 35.264 437.3 0.078 2.54306 3.57 35.5326 412.09 0.0468 2.52445 3.37 36.1622 418.43 0.156 2.48193 3.42 36.6015 376.67 0.1872 2.45315 3.08 37.239 295.68 0.156 2.4126 2.42 37.714 195.04 0.1092 2.3833 1.59 35.5326 412.09 0.0468 2.52445 3.37

[0187] The spectra of TGA/DSC of Compound 1 is shown in FIG. 5, and the single-crystal diffraction spectrum thereof is shown in FIG. 6.

Example 1: Compatibility of Auxiliary Material and Compound 1

[0188] The mixture of active material compound 1 and various types of filler was prepared according to table 1, and placed uncovered under a condition of a moisture and heat of 75% RH and 40° C., then was measured for its impurity content, respectively. The testing results for impurity are shown in Table 2.

TABLE-US-00002 TABLE 1 Mixtures of Compound 1 with various types of fillers Scheme Scheme Scheme Scheme Scheme Scheme Scheme Scheme Materials 1 2 3 4 5 6 7 8 Compound 1 1 part.sup.  1 part.sup.  1 part.sup.  1 part.sup.  1 part.sup.  1 part.sup.  1 part.sup.  1 part.sup.  Mannitol 5 parts 0 0 0 0 0 0 0 Lactose 0 5 parts 0 0 0 0 0 0 Starch 0 0 5 parts 0 0 0 0 0 Pregelatinized 0 0 0 5 parts 0 0 0 0 starch Sorbitol 0 0 0 0 5 parts 0 0 0 Saccharose 0 0 0 0 0 5 parts 0 0 Low-substituted 0 0 0 0 0 0 5 parts 0 hydroxypropyl cellulose Microcrystalline 0 0 0 0 0 0 0 5 parts cellulose

[0189] The preparation of the mixture of Compound 1 and various types of fillers was as follows: [0190] (1) subjecting Compound 1 to a 60-mesh sieve, and subjecting the filler to a 40-mesh sieve for use; [0191] (2) mixing Compound 1 and the filler uniformly to obtain a mixed powder; [0192] (3) placing a sample uncovered under a condition of a moisture and heat of 75% RH and 40° C.

TABLE-US-00003 TABLE 2 the variations in the impurity content in the mixture of Compound 1 and various fillers Total impurity/% No. Day 0 Day 7 Day 14 Day 30 Scheme 1 0.054 0.056 0.064 0.173 Scheme 2 0.061 0.068 0.166 0.297 Scheme 3 0.054 0.068 0.123 0.282 Scheme 4 0.059 0.139 0.272 0.381 Scheme 5 0.064 0.078 0.148 0.298 Scheme 6 0.062 0.185 0.312 0.425 Scheme 7 0.068 0.098 0.112 0.188 Scheme 8 0.042 0.056 0.057 0.063

[0193] Conclusion: the mannitol, low-substituted hydroxypropyl cellulose and microcrystalline cellulose have good compatibility with Compound 1.

Example 2: The Effect of Various Types of Fillers on the Mixing Uniformity of the Capsule Formulation

[0194] The capsules of Compound 1 are prepared according to Table 3, by a preparation method as follows: [0195] (1) subjecting Compound 1 to a 60-mesh sieve, and subjecting the filler to a 40-mesh sieve for use; [0196] (2) adding the sieved Compound 1 and the filler in a multi-directional movement mixer for uniform mixing; [0197] (3) adding a binder, a disintegrating agent and a glidant into the multi-directional movement mixer for uniform mixing with the mixture in (2); [0198] (4) adding a lubricating agent in the multi-directional movement mixer for a final mixing with the mixture in (3); [0199] (5) selecting an appropriate type of capsule and filling the capsule with the final mixture obtained in (4).

TABLE-US-00004 TABLE 3 the capsules with various fillers formulation composition of a single dosage, No. Raw materials Amount by weight percent Functions Formulation 1 Compound 1 (in terms of 1 part 4.08 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Mannitol 20 parts 81.63  Filler Hydroxypropyl Cellulose 1 part 4.08 Binder Silica 1 part 4.08 Glidant Croscarmellose sodium 1 part 4.08 Disintegrating agent Magnesium stearate 0.5 part 2.04 Lubricating agent Gelatin capsule 1 capsule 1 capsule — Formulation 2 Compound 1 (in terms of 1 part 4.08 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Low-substituted hydroxypropyl 20 parts 81.63  Filler cellulose Hydroxypropyl Cellulose 1 part 4.08 Binder Silica 1 part 4.08 Glidant Croscarmellose sodium 1 part 4.08 Disintegrating agent Magnesium stearate 0.5 part 2.04 Lubricating agent Gelatin capsule 1 capsule 1 capsule — Formulation 3 Compound 1 (in terms of 1 part 4.08 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Microcrystalline cellulose 12 20 parts 81.63  Filler Hydroxypropyl Cellulose 1 part 4.08 Binder Silica 1 part 4.08 Glidant Croscarmellose sodium 1 part 4.08 Disintegrating agent Magnesium stearate 0.5 part 2.04 Lubricating agent Gelatin capsule 1 capsule 1 capsule —

[0200] The capsules of Compound 1 were assayed by high-performance liquid chromatography, according to General Rule 0941 “a test method for content uniformity” in Chinese Pharmacopoeia, 2015 edition. The results are shown in Table 4.

TABLE-US-00005 TABLE 4 Uniformity of the capsules of Compound 1 No. Value of A + 2.2S RSD % Formulation 1 10.75 6.56 Formulation 2 12.64 7.42 Formulation 3 8.42 4.38

Example 3: The Effect of the Combination of Various Types of Fillers on Formulation Stability and Content Uniformity

[0201] The capsules of Compound 1 were prepared according to the ratios in Table 5, by the preparation method as shown in Example 2, and the content uniformity and stability thereof were measured.

TABLE-US-00006 TABLE 5 The raw materials for the capsules of Compound 1 The composition of a single dosage, No. Raw materials Amount by weight percent Functions Formulation 4 Compound 1 (in terms of 1 part 3.92 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Mannitol 7 parts 27.45 Filler Low-substituted hydroxypropyl cellulose 7 parts 27.45 Filler Microcrystalline cellulose 102 7 parts 27.45 Filler Hydroxypropyl Cellulose 1 part 3.92 Binder Silica 1 part 3.92 Glidant Croscarmellose sodium 1 part 3.92 Disintegrating agent Magnesium stearate 0.5 part 1.96 Lubricating agent Gelatin capsule 1 capsule 1 capsule — Formulation 5 Compound 1 (in terms of 1 part 3.92 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Mannitol 0 part 0.00 Filler Low-substituted hydroxypropyl cellulose 7 parts 27.45 Filler Microcrystalline cellulose 102 14 parts 54.90 Filler Hydroxypropyl Cellulose 1 part 3.92 Binder Silica 1 part 3.92 Glidant Croscarmellose sodium 1 part 3.92 Disintegrating agent Magnesium stearate 0.5 part 1.96 Lubricating agent Gelatin capsule 1 capsule 1 capsule — Formulation 6 Compound 1 (in terms of 1 part 3.92 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Mannitol 7 parts 27.45 Filler Low-substituted hydroxypropyl cellulose 0 part 0.00 Filler Microcrystalline cellulose 102 14 parts 54.90 Filler Hydroxypropyl Cellulose 1 part 3.92 Binder Silica 1 part 3.92 Glidant Croscarmellose sodium 1 part 3.92 Disintegrating agent Magnesium stearate 0.5 part 1.96 Lubricating agent Gelatin capsule 1 capsule 1 capsule — Formulation 7 Compound 1 (in terms of 1 part 3.92 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Mannitol 7 parts 27.45 Filler Low-substituted hydroxypropyl cellulose 14 parts 54.90 Filler Microcrystalline cellulose 102 0 part 0.00 Filler Hydroxypropyl Cellulose 1 part 3.92 Binder Silica 1 part 3.92 Glidant Croscarmellose sodium 1 part 3.92 Disintegrating agent Magnesium stearate 0.5 part 1.96 Lubricating agent Gelatin capsule 1 capsule 1 capsule — Formulation 8 Compound 1 (in terms of 1 part 9.52 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Mannitol 3 parts 28.57 Filler Microcrystalline cellulose 102 3 parts 28.57 Filler Hydroxypropyl Cellulose 1 part 9.52 Binder Silica 1 part 9.52 Glidant Croscarmellose sodium 1 part 9.52 Disintegrating agent Magnesium stearate 0.5 part 4.76 Lubricating agent Gelatin capsule 1 capsule 1 capsule — Formulation 9 Compound 1 (in terms of 1 part 1.55 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Mannitol 30 parts 46.51 Filler Microcrystalline cellulose 102 30 parts 46.51 Filler Hydroxypropyl Cellulose 1 part 1.55 Binder Silica 1 part 1.55 Glidant Croscarmellose sodium 1 part 1.55 Disintegrating agent Magnesium stearate 0.5 part 0.78 Lubricating agent Gelatin capsule 1 capsule 1 capsule —

[0202] The capsules of Compound 1 as prepared in Example 3 were assayed by high-performance liquid chromatography, according to General Rule 0941 “a test method for content uniformity” in Chinese Pharmacopoeia, 2015 edition. The results are shown in Table 6.

TABLE-US-00007 TABLE 6 Uniformity of the capsules of Compound 1 No. Value of A + 2.2S RSD % Formulation 4 6.25 2.53 Formulation 5 6.34 2.18 Formulation 6 4.11 1.52 Formulation 7 5.48 2.45 Formulation 8 10.25 4.13 Formulation 9 12.34 4.28

[0203] The impurity detection was carried out by placing the samples uncovered under a condition of a moisture and heat of 75% RH and 40° C. to measure its impurity content. The detection results are shown in Table 7.

TABLE-US-00008 TABLE 7 The stability of capsules of Compound 1 Total impurity/% No. Day 0 Day 7 Day 14 Day 30 Formulation 4 0.054 0.153 0.284 0.573 Formulation 5 0.061 0.098 0.256 0.547 Formulation 6 0.057 0.061 0.201 0.372 Formulation 7 0.059 0.139 0.372 0.781

[0204] The results show that the impurity levels of Formulations 4-7 were high after 30 days.

Example 4: The Wet Preparation of Capsules of Compound 1

[0205] The capsules of Compound 1 were prepared according to the formulations in Table 8 by a preparation method as follows: [0206] (1) subjecting Compound 1 to a 60-mesh sieve, and subjecting mannitol and microcrystalline cellulose to a 40-mesh sieve for use; [0207] (2) formulating a hydroxypropyl cellulose into a 40% aqueous ethanol solution as a binder; [0208] (3) adding Compound 1, mannitol and microcrystalline cellulose into a wet granulator, and adding the binder in (2) thereinto for mixing by shearing to prepare a soft material; [0209] (4) subjecting the soft material to a sieve for producing particles, and then performing static drying; [0210] (5) subjecting the dried soft materials to granulation, and then adding it with croscarmellose sodium and silica in a multi-directional movement mixer for uniform mixing; [0211] (6) adding magnesium stearate in the multi-directional movement mixer for a final mixing; [0212] (7) selecting an appropriate type of capsule and filling the capsule with the mixed powders.

TABLE-US-00009 TABLE 8 the raw materials for capsules of Compound 1 Weight No. Raw materials Amount percentage (%) Functions Formulation 10 Compound 1 (in terms of 1 part 3.92 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Mannitol 7 parts 27.45 Filler Microcrystalline cellulose 102 14 parts 54.90 Filler Hydroxypropyl Cellulose 1 part 3.92 Binder Silica 1 part 3.92 Glidant Croscarmellose sodium 1 part 3.92 Disintegrating agent Magnesium stearate 0.5 part 1.96 Lubricating agent Gelatin capsule 1 capsule 1 capsule —

[0213] The capsules of Compound 1 as prepared were assayed by high-performance liquid chromatography, according to General Rule 0941 “a test method for content uniformity” in Chinese Pharmacopoeia, 2015 edition. The results are shown in Table 9.

TABLE-US-00010 TABLE 9 Content uniformity of the capsules of Compound 1 No. Value of A + 2.2S RSD % Formulation 10 5.42 2.54

[0214] Conclusion: the composition as prepared has a value of A+2.2S equal to or less than 15, satisfying the requirement as described in Chinese Pharmacopoeia, 2015 edition for the content uniformity.

[0215] The capsule of Compound 1 as prepared was subjected to a dissolution test using high performance liquid chromatography, and the results are shown in Table 10.

TABLE-US-00011 TABLE 10 the dissolution of the capsule of Compound 1 No. Dissolution rate after 15 mins (%) Formulation 10 92.5

[0216] Conclusion: the composition as prepared can be rapidly dissolved out.

Example 5: The Wet Preparation of Capsules of Compound 1

[0217] The capsules of Compound 1 were prepared according to the formulations in Table 11 by a preparation method as follows: [0218] (1) subjecting Compound 1 to a 60-mesh sieve, and subjecting mannitol and microcrystalline cellulose to a 40-mesh sieve for use; [0219] (2) formulating a 40% aqueous ethanol solution as a solvent; [0220] (3) adding Compound 1, hydroxypropyl methyl cellulose, mannitol and microcrystalline cellulose into a wet granulator, and adding the solvent in (2) therein for mixing by shearing to prepare a soft material; [0221] (4) subjecting the soft material to a sieve for producing particles, and then performing dynamic drying on a fluidized bed; [0222] (5) subjecting the dried soft materials to granulation, and then adding it with croscarmellose sodium and silica in a multi-directional movement mixer for uniform mixing; [0223] (6) adding magnesium stearate in the multi-directional movement mixer for a final mixing; [0224] (7) selecting an appropriate type of capsule and filling the capsule with the mixed powders.

TABLE-US-00012 TABLE 11 the raw materials for capsules of Compound 1 Weight No. Raw materials Amount percentage (%) Functions Formulation 11 Compound 1 (in terms of 1 part 3.92 Active C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Mannitol 7 parts 27.45 Filler Microcrystalline cellulose 102 14 parts 54.90 Filler Hydroxypropyl Cellulose 1 part 3.92 Binder Silica 1 part 3.92 Glidant Croscarmellose sodium 1 part 3.92 Disintegrating agent Magnesium stearate 0.5 part 1.96 Lubricating agent Gelatin capsule 1 capsule 1 capsule —

[0225] The capsules of Compound 1 as prepared were assayed by high-performance liquid chromatography, according to General Rule 0941 “a test method for content uniformity” in Chinese Pharmacopoeia, 2015 edition. The results are shown in Table 12.

TABLE-US-00013 TABLE 12 Content uniformity of the capsules of Compound 1 No. Value of A + 2.2S RSD % Formulation 11 6.41 1.78

[0226] Conclusion: the composition as prepared has a value of A+2.2S equal to or less than 15, satisfying the requirement as described in Chinese Pharmacopoeia, 2015 edition for the content uniformity.

[0227] The capsule of Compound 1 as prepared was subjected to a dissolution test using high performance liquid chromatography, and the results are shown in Table 13.

TABLE-US-00014 TABLE 13 the dissolution of the capsule of Compound 1 No. Dissolution rate after 15 mins (%) Formulation 11 92.4

[0228] Conclusion: the composition as prepared can be rapidly dissolved out.

[0229] The capsules of Compound 1 were prepared according to Table 14 by the method as described in Example 5. The capsules as prepared had a content uniformity satisfying the requirement in Chinese Pharmacopoeia, 2015 edition.

TABLE-US-00015 TABLE 14 the raw materials and compositions for capsules of Compound 1 Capsule No. Actives Filler 1 Filler 2 Binder Glidant Disintegrant Lubricant shell Formulation 1 part Mannitol MCC HPC Silica CMS1 part Magnesium One 12 30 parts 30 parts 1 part 1 part stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Magnesium One 13 7 parts 14 parts 1 part 1 part stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC HPC Silica CMSS 1 part Magnesium One 14 7 parts 14 parts 1 part 1 part stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Magnesium One 15 7 parts 14 parts 0.1 part 1 part stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Magnesium One 16 7 parts 14 parts 3 parts 1 part stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC HPMC Silica CMS 1 part Magnesium One 17 7 parts 14 parts 0.1 part 1 part stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC HPMC Silica CMS 1 part Magnesium One 18 7 parts 14 parts 3 parts 1 part stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC Povidone Silica CMS 1 part Magnesium One 19 7 parts 14 parts 0.1 part 1 part stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC Povidone Silica CMS 1 part Magnesium One 20 7 parts 14 parts 5 parts 1 part stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Magnesium One 21 7 parts 14 parts 1 part 5 parts stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC HPC Talc CMS 1 part Magnesium One 22 7 parts 14 parts 1 part 1 part stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC HPC Talc CMS 1 part Magnesium One 23 7 parts 14 parts 1 part 5 parts stearate Gelatin 0.5 part capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Magnesium One 24 7 parts 14 parts 1 part 1 part stearate Gelatin 2  capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Magnesium One 25 7 parts 14 parts 1 part 1 part stearate Gelatin 0.1 part capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Stearic acid One 26 7 parts 14 parts 1 part 1 part 2 parts Gelatin capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Stearic acid One 27 7 parts 14 parts 1 part 1 part 0.1 part Gelatin capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part SSF One 28 7 parts 14 parts 1 part 1 part 2 parts Gelatin capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part SSF One 29 7 parts 14 parts 1 part 1 part 0.1 part Gelatin capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Glyceryl One 30 7 parts 14 parts 1 part 1 part Behenate Gelatin 2 parts capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Glyceryl One 31 7 parts 14 parts 1 part 1 part Behenate Gelatin 0.1 part capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Magnesium One blank 32 7 parts 14 parts 1 part 1 part stearate HPS 0.5 part capsule Formulation 1 part Mannitol MCC HPC Silica CMS 1 part Magnesium One HPMC 33 7 parts 14 parts 1 part 1 part stearate capsule 0.5 part

[0230] The abbreviations in the above table:

[0231] MCC: Microcrystalline cellulose

[0232] HPC: Hydroxypropyl cellulose

[0233] HPMC: Hydroxypropyl methyl cellulose

[0234] CMS: Croscarmellose sodium

[0235] HPS: Hydroxypropyl starch

Example 6: Capsules of Compound 1

[0236] The capsules of Compound 1 were prepared according to the formulations in Table 15 by a preparation method as follows: [0237] (1) subjecting a bulk drug of Compound 1 to a 60-mesh sieve, and subjecting the filler to a 40-mesh sieve for use; [0238] (2) adding the Compound 1 and the filler in a multi-directional movement mixer for uniform mixing; [0239] (3) adding a lubricating agent and other additives in the multi-directional movement mixer for a final mixing with the mixture in (2); [0240] (4) filling a capsule with the mixed powders.

TABLE-US-00016 TABLE 15 the raw materials and compositions for capsules of Compound 1 Weight No. Raw materials Amount percentage (%) Functions Formulation 34 Compound 1 (in terms of 1 part 5.52 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 17 parts 93.92  Filler Magnesium stearate 0.1 part 0.55 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule — Formulation 35 Compound 1 (in terms of 1 part 5.52 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Microcrystalline cellulose 102 17 parts 93.92  Filler Magnesium stearate 0.1 part 0.55 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule — Formulation 36 Compound 1 (in terms of 1 part 6.06 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 5 parts 30.30  Filler Microcrystalline cellulose 102 10 parts 62.11  Filler Magnesium stearate 0.1 part 0.62 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule —

[0241] The capsules of Compound 1 as prepared were assayed by high-performance liquid chromatography, according to General Rule 0941 “a test method for content uniformity” in Chinese Pharmacopoeia, 2015 edition. The results are shown in Table 16.

TABLE-US-00017 TABLE 16 Content uniformity of the capsules of Compound 1 Value of A + 2.2S No. of Capsules RSD % of mixed powders Formulation 34 18.9 9.64 Formulation 35 21.4 12.5 Formulation 36 15.4 6.24

[0242] Conclusion: the formulations 34, 35 and 36 have a value of A+2.2S larger than 15, which does not satisfy the requirement as described in Chinese Pharmacopoeia, 2015 edition for the content uniformity.

Example 7: Capsules of Compound 1

[0243] The capsules of Compound 1 were prepared according to the formulations in Table 17 by a preparation method as follows: [0244] (1) subjecting a bulk drug of Compound 1 to a 60-mesh sieve, and subjecting the filler to a 40-mesh sieve for use; [0245] (2) adding the Compound 1 and the filler in a multi-directional movement mixer for uniform mixing; [0246] (3) adding a lubricating agent and other additives in the multi-directional movement mixer for a final mixing with the mixture in (2); [0247] (4) filling a capsule with the mixed powders.

TABLE-US-00018 TABLE 17 the raw materials and compositions for capsules of Compound 1 Weight No. Raw materials Amount percentage (%) Functions Formulation 37 Compound 1 (in terms of 1 part 5.85 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 5 parts 29.24 Filler Microcrystalline cellulose 102 10 parts 58.48 Filler Hydroxypropyl cellulose 1 part 5.85 Binder Magnesium stearate 0.1 part 0.58 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule — Formulation 38 Compound 1 (in terms of 1 part 5.85 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 5 parts 29.24 Filler Microcrystalline cellulose 102 5 parts 29.24 Filler Microcrystalline cellulose 101 5 parts 29.24 Filler Hydroxypropyl cellulose 1 part 5.85 Binder Magnesium stearate 0.1 part 0.58 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule —

[0248] Impurity test: the sample was placed under a condition of a moisture of 75% RH and 40° C. (uncovered) for its impurity test. The variations of a total impurity content are shown in Table 18.

TABLE-US-00019 TABLE 18 Variations of a total impurity content in capsules of Compound 1 Total impurity/% Sample No. Day 0 Day 7 Day 14 Day 30 Formulation 37 0.051 0.065 0.148 0.342 Formulation 38 0.054 0.066 0.164 0.387

[0249] The capsules of Compound 1 as prepared were assayed by high-performance liquid chromatography, according to General Rule 0941 “a test method for content uniformity” in Chinese Pharmacopoeia, 2015 edition. The results are shown in Table 19.

TABLE-US-00020 TABLE 19 Content uniformity of the capsules of Compound 1 Value of A + 2.2S No. of Capsules RSD % of mixed powders Formulation 37 10.5 5.44 Formulation 38 8.42 4.29

[0250] It can be seen from the above results that the compatibility of the active material and excipients was improved.

Example 8: Capsules of Compound 1

[0251] The capsules of Compound 1 were prepared according to the formulations in Table 20 by a preparation method as follows: [0252] (1) subjecting a bulk drug of Compound 1 to a 60-mesh sieve, and subjecting the filler to a 40-mesh sieve for use; [0253] (2) adding the Compound 1 and the filler in a multi-directional movement mixer for uniform mixing; [0254] (3) adding a lubricating agent and other additives in the multi-directional movement mixer for a final mixing with the mixture in (2); [0255] (4) filling a capsule with the mixed powders.

TABLE-US-00021 TABLE 20 the raw materials and compositions for capsules of Compound 1 Weight No. Raw materials Amount percentage (%) Functions Formulation 39 Compound 1 (in terms of 1 part 6.21 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 5 parts 31.06 Filler Microcrystalline cellulose 102 5 parts 31.06 Filler Microcrystalline cellulose 103 5 parts 31.06 Filler Magnesium stearate 0.1 part 0.62 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule — Formulation 40 Compound 1 (in terms of 1 part 6.21 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 5 parts 31.06 Filler Microcrystalline cellulose 102 5 part 31.06 Filler Microcrystalline cellulose 112 5 parts 31.06 Filler Magnesium stearate 0.1 part 0.62 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule — Formulation 41 Compound 1 (in terms of 1 part 6.21 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 5 parts 31.06 Filler Microcrystalline cellulose 102 5 parts 31.06 Filler Microcrystalline cellulose 14 5 parts 31.06 Filler Magnesium stearate 0.1 part 0.62 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule — Formulation 42 Compound 1 (in terms of 1 part 6.21 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 5 parts 31.06 Filler Microcrystalline cellulose 102 5 parts 31.06 Filler Microcrystalline cellulose 12 5 parts 31.06 Filler Magnesium stearate 0.1 part 0.62 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule — Formulation 43 Compound 1 (in terms of 8 parts 44.2 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Microcrystalline cellulose 102 7.6 parts 41.99 Filler Microcrystalline cellulose 12 0.6 part 3.31 Filler Mannitol 1.8 parts 9.94 Filler Magnesium stearate 0.1 part 0.55 Lubricating agent Gelatin blank capsule 1 capsule — Formulation 44 Compound 1 (in terms of 1 part 5.85 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Microcrystalline cellulose 102 3 parts 17.54 Filler Microcrystalline cellulose 12 10 parts 58.48 Filler Mannitol 3 parts 17.54 Filler Magnesium stearate 0.1 part 0.58 Lubricating agent Gelatin blank capsule 1 capsule — Formulation 45 Compound 1 (in terms of 1 part 5.26 — C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Microcrystalline cellulose 102 13 parts 68.42 Filler Microcrystalline cellulose 12 1 part 5.26 Filler Mannitol 3 part 15.79 Filler Magnesium stearate 1 part 5.26 Lubricating agent Gelatin blank capsule 1 capsule —

[0256] The capsules of Compound 1 as prepared were assayed by high-performance liquid chromatography, according to General Rule 0941 “a test method for content uniformity” in Chinese Pharmacopoeia, 2015 edition. The results are shown in Table 21.

TABLE-US-00022 TABLE 21 Content uniformity of the capsules of Compound 1 Value of A + 2.2S No. of Capsules RSD % of mixed powders Formulation 39 15.3 8.47 Formulation 40 11.4 7.58 Formulation 41 10.7 7.4 Formulation 42 8.5 5.18 Formulation 43 4.67 1.21 Formulation 44 6.27 2.87 Formulation 45 7.24 0.97

[0257] Conclusion: the formulation 39 has a value of A+2.2S larger than 15, which does not satisfy the requirement as described in Chinese Pharmacopoeia, 2015 edition for the content uniformity. The formulations 42, 43, 44 and 45 were improved in the content uniformity.

Example 9: The Preparation of Capsule Formulations of Specification of 5 mg and 20 mg of an Active Material (in Terms of Free Base of Compound 1)

[0258] The capsules of Compound 1 were prepared according to the formulations in Table 22 by a preparation method as follows: [0259] (1) subjecting a bulk drug of Compound 1 to a 60-mesh sieve, and subjecting the filler to a 40-mesh sieve for use; [0260] (2) adding the Compound 1 and the filler in a multi-directional movement mixer for uniform mixing; [0261] (3) adding a lubricating agent in the multi-directional movement mixer for a final mixing with the mixture in (2); [0262] (4) filling a capsule with the mixed powders.

TABLE-US-00023 TABLE 22 the compositions for capsules of Compound 1 Weight No. Raw materials Amount percentage (%) Functions Formulation 46 Compound 1 (in terms of 1 part 5.52 Active (5 mg) C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Microcrystalline cellulose 102 13 parts 71.82 Filler Microcrystalline cellulose 12 1 part 5.52 Filler Mannitol 3 parts 16.57 Filler Magnesium stearate 0.1 part 0.55 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule — Formulation 47 Compound 1 (in terms of 1 part 5.52 Active (5 mg) C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Microcrystalline cellulose 102 11 parts 60.77 Filler Microcrystalline cellulose 12 1 part 5.52 Filler Mannitol 5 parts 27.62 Filler Magnesium stearate 0.1 part 0.55 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule — Formulation 48 Compound 1 (in terms of 4 parts 20.41 Active (20 mg) C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Microcrystalline cellulose 102 11 parts 56.12 Filler Microcrystalline cellulose 12 1.5 parts 7.65 Filler Mannitol 3 parts 15.31 Filler Magnesium stearate 0.1 part 0.51 Lubricating agent Gelatin blank capsule 1 capsule 1 capsule —

[0263] The capsules of Compound 1 as prepared were assayed by high-performance liquid chromatography, according to General Rule 0941 “a test method for content uniformity” in Chinese Pharmacopoeia, 2015 edition. The results are shown in Table 23.

TABLE-US-00024 TABLE 23 Content uniformity of the capsules of Compound 1 No. Value of A + 2.2S RSD % Formulation 46 3.52 1.09 Formulation 47 3.21 0.86 Formulation 48 3.18 0.94

[0264] It can be seen from the test results that the formulations 46 to 48 were improved in the content uniformity.

[0265] The capsules of Compound 1 as prepared were also subjected to a dissolution test by high performance liquid chromatography, and the test results are shown in Table 24.

TABLE-US-00025 TABLE 24 Dissolution of capsules of Compound 1 Dissolution rate % Month 0 No. 3 mins 5 mins 10 mins 15 mins 20 mins 30 mins Formulation 66.24 91.21 99.81 100.03 101.08 101.15 46 Formulation 64.69 90.69 99.65 101.21 102.17 102.89 47 Formulation 71.30 90.29 96.46 98.30 98.98 99.06 48

[0266] It can be seen from the test results that the compositions as prepared can all dissolved out rapidly.

Example 10: Study on Stability

[0267] Objectives: to perform study on the stability for formulations 47 and 48.

[0268] Method: the capsules of formulations 47 and 48 were packed by aluminium foil and a solid composite plate of polyvinyl chloride/polyethylene/polyvinylidene chloride for medicine, placed uncovered under the conditions of 75% RH and 40° C. for 1 month, and then measured for its impurity content, active material content (equal to a ratio of the active material content as tested to the active material content as marked, by using a mark content as reference) and dissolution speed. The result is shown in Tables 25-27.

TABLE-US-00026 TABLE 25 Variations in total impurity content Total impurity content(%) No. 1 month 3 months 6 months Formulation 47 0.121 0.153 0.237 Formulation 48 0.117 0.136 0.197

TABLE-US-00027 TABLE 26 Variations in the content Content, % (compared to the mark content) No. 1 month 3 months 6 months Formulation 47 100.57 100.16 99.98 Formulation 48 100.86 100.06 100.05

TABLE-US-00028 TABLE 27 Dissolution Dissolution rate after 15 mins (%) No. 1 month 3 months 6 months Formulation 47 99.74 99.12 98.31 Formulation 48 98.28 98.21 98.09

Example 11: Tablets of Compound 1 with Various Specification

[0269] The tablets of Compound 1 with various specification (in terms of free base of Compound 1) are prepared according to the composition in Table 28.

TABLE-US-00029 TABLE 28 the composition of tablets of Compound 1 No. Raw materials Amount (mg) Functions Formulation 49 Compound 1 (in terms of 26.34 — (15 mg) C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 42.31 Filler Microcrystalline cellulose 126.91 Filler Hydroxypropyl methyl cellulose 15.00 Binder Croscarmellose sodium 20.00 Disintegrating agent Magnesium stearate 2.00 Lubricating agent Formulation 50 Compound 1 (in terms of 52.68 — (30 mg) C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 42.31 Filler Microcrystalline cellulose 126.91 Filler Hydroxypropyl methyl cellulose 15.00 Binder Croscarmellose sodium 20.00 Disintegrating agent Magnesium stearate 2.00 Lubricating agent Formulation 51 Compound 1 (in terms of 105.36 — (60 mg) C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) Mannitol 42.31 Filler Microcrystalline cellulose 126.91 Filler Hydroxypropyl methyl cellulose 15.00 Binder Croscarmellose sodium 20.00 Disintegrating agent Magnesium stearate 2.00 Lubricating agent Formulation 52 Compound 1 (in terms of 8.78 Active (5 mg) C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Microcrystalline cellulose 102 114.14 Filler Microcrystalline cellulose 12 8.78 Filler Mannitol 26.34 Filler Magnesium stearate 0.88 Lubricating agent Formulation 53 Compound 1 (in terms of 8.78 Active (5 mg) C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Microcrystalline cellulose 102 96.58 Filler Microcrystalline cellulose 12 8.78 Filler Mannitol 43.9 Filler Magnesium stearate 0.88 Lubricating agent Formulation 54 Compound 1 (in terms of 35.12 Active (20 mg) C.sub.12H.sub.19NO.sub.2•C.sub.6H.sub.6O.sub.3S) material Microcrystalline cellulose 102 96.58 Filler Microcrystalline cellulose 12 13.17 Filler Mannitol 26.34 Filler Magnesium stearate 0.88 Lubricating agent

[0270] The preparation method is as follows: [0271] (1) subjecting an active drug of Compound 1 to a 100-mesh sieve, and subjecting the filler and disintegrating agent to a 60-mesh sieve for use; [0272] (2) adding the active drug of Compound 1, the filler and the disintegrating agent into a high-speed wet granulator for uniform mixing; [0273] (3) adding a prescribed amount of a solution of hydroxypropyl methyl cellulose as a binder to prepare a soft material; [0274] (4) subjecting the soft material to a 20-mesh sieve for producing particles; [0275] (5) subjecting the particles as produced to dynamic drying on a fluidized bed to adjust the moisture content to be less than 2%; [0276] (6) subjecting the dried particles to a 24-mesh sieve for granulating; [0277] (7) adding the granules with a prescribed amount of magnesium stearate into a multi-directional movement mixer for uniform mixing; and [0278] (8) press-molding the final mixed powders with a mould having a proper size into tablets.

Example 12: The Stability Test

[0279] The tablets in formulations 49 to 54 were placed uncovered under the conditions of a temperature of 40° C.±2° C., and a relative humidity of 75%±5%, respectively. Then, they were tested on day 7, day 14 and day 30 for the relevant materials. The test results are shown in Table 29.

TABLE-US-00030 TABLE 29 test results of relevant materials Examples Day 0 Day 7 Day 14 Day 30 Numbers of impurities Formulation 49 4 5 5 8 Formulation 50 5 5 5 8 Formulation 51 5 5 5 8 Formulation 52 3 4 4 5 Formulation 53 3 4 4 4 Formulation 54 3 4 5 6 Total impurity content (%) Formulation 49 0.037 0.056 0.060 0.085 Formulation 50 0.061 0.066 0.097 0.120 Formulation 51 0.054 0.055 0.064 0.173 Formulation 52 0.039 0.048 0.051 0.073 Formulation 53 0.036 0.048 0.054 0.087 Formulation 54 0.040 0.052 0.060 0.085

[0280] Conclusion: it can be seen from the test results that impurities increase of formulations 49-54 are not significant and the formulations are relatively stable.

Example 13: The Preparation of Tablets by One-Step Method

[0281] The formulations 49-2, 50-2 and 51-2 were respectively produced by using a top spray process on a fluidized bed, according to the compositions of formulations 49, 50 and 51.

[0282] The method for preparing tablets by one-step method is as follows: [0283] (1) subjecting an active drug of Compound 1 to a 100-mesh sieve, and subjecting the filler and disintegrating agent to a 60-mesh sieve for use; [0284] (2) adding the active drug of Compound 1, the filler and the disintegrating agent into a multi-directional movement mixer for uniform mixing; [0285] (3) adding the mixed powder to a fluidized bed, pumping a solution of hydroxypropyl methyl cellulose into the fluidized bed with a peristaltic pump, and producing particles by top spray, wherein the inlet temperature is set to 60° C. to 65° C., the material temperature is controlled to 30° C. to 35° C., the air feeding rate is set to 140 m.sup.3/h to 180 m.sup.3/h, and the peristaltic pump is controlled to 20 rpm to 80 rpm; [0286] (4) subjecting the dried particles to a 24-mesh sieve for granulating; [0287] (5) adding the granules with magnesium stearate into a multi-directional movement mixer for uniform mixing; and [0288] (6) press-molding the final mixed powders with a mould having a proper size into tablets.

[0289] The tablets in formulations 49-2, 50-2 and 51-2 were placed uncovered under the conditions of a temperature of 40° C.±2° C., and a relative humidity of 75%±5%, respectively. Then, they were tested on day 7, day 14 and day 30 for the relevant materials. The test results are shown in Table 30.

TABLE-US-00031 TABLE 30 test results of relevant materials No. Day 0 Day 7 Day 14 Day 30 Numbers of impurities Formulation 49-2 4 5 5 8 Formulation 50-2 5 5 5 8 Formulation 51-2 5 5 5 8 Total impurity content (%) Formulation 49-2 0.036 0.055 0.060 0.084 Formulation 50-2 0.060 0.064 0.095 0.120 Formulation 51-2 0.053 0.054 0.064 0.172

[0290] Conclusion: it can be seen from the test results that impurities increase of formulations 54-2, 56-2 and 62-2 are not significant and the tablets are relatively stable. Meanwhile, compared with tablets obtained by a high-efficiency wet granulation process, the impurity content has no obvious difference.

Example 14: Bioassay

[0291] 1. Test on the Competitive Binding Ability of Compounds to the Calcium-Ion Channel Protein Cavα2δ

[0292] A rat cerebral cortex tissue was placed in an ice-cold 0.32M sucrose/5 mM Tris-acetic acid (pH 7.4) having a 10-folded volume, and subjected to a sucrose density gradient centrifugation to prepare synaptic plasma membrane, which was stored in a Tris-acetic acid (pH 7.4) buffer, and re-suspended in a 10 mM HEPES (pH 7.4) buffer prior to use. The test compound was dissolved in 1% DMSO and diluted to a gradient concentration (1 nM-1000 nM), added to the suspension of synaptic plasma membrane (having about 0.05-0.1 mg protein in total) with 20 nM [3H]gabapentin and incubated at 25° C. for 30 mins. At the end of the reaction, the system was vacuum filtered into Whatman GFB membranes, which were washed three times with 5 mL of 100 mM ice-cold sodium chloride. The radioactivity of the membranes were measured by a liquid scintillation counter. Non-specific binding was closed with 100 mM gabapentin. The inhibition rate of the compound on the binding of radiolabeled gabapentin to the synaptic plasma membrane was calculated and the IC50 of the compound was also calculated. IC50 for Compound 1 is 3.96 nM. Compound 1 has a good competitive binding capacity to the calcium-ion channel protein Cavα2δ.

[0293] 2. Animal Models of L5-L6 Spinal Nerve Ligation (SNL)

[0294] Six- to seven-week-old SD male rats (from Charles River) were anesthetized with 5% isoflurane in an animal surgical setting. The anesthetized animals were placed in prone position, incised at the 5th lumbar vertebra. The skin was opened to expose the left paravertebral muscles, and the L5 and L6 spinal nerves were exposed by laceration layer by layer. 4-0 surgical wires were used to ligate the distal ends of the L5 and L6 dorsal root ganglia. The muscles and skin were sutured layer by layer, and the animals were left recovered for one week.

[0295] After recovery, the model animals were tested for contact pain using a Von Frey wire (DanMic Global, USA). The “up-down” method was used to measure the strength of the animal having 50% leg retraction response (g; 50% PWT). First, animals were grouped with a 50% PWT of 1-5 g. Before administration, animals were tested for base value, followed by oral administration of different compounds (formulated with 5% sodium carboxymethyl cellulose). The animals were tested for pain responses at different timing for the test range of 1.0 g to 15 g. The test results are shown in FIG. 1. Conclusion: The compounds according to the present disclosure can significantly inhibit the mechanical pain hypersensitivity caused by spinal nerve ligation in rats.

[0296] 3. Rat CCI-Induced Nociception Sensitization Model

[0297] SD rats of 160-180 g were purchased from Charles River (Beijing) with a license number of sCXK (Beijing)-2012-001 and a qualification number of 11400700254251. The surgery was performed to establish the CCI model as follows: the animals ware first anesthetized, then the left posterior sciatic nerve was exposed. A 2 mm long PE-90 catheter was applied to the middle site of the sciatic nerve. Finally the muscle and skin were sutured. Adaptation of the animal's left hind limb at 15 g was carried out from day 10 after the surgery, three times a week.

[0298] The baseline testing was performed 17 days after surgery (starting from 2 g at the time of testing, with an upper limit of 8 g and a lower limit of 1 g which is the −24h point), with a pain threshold of 1-4 g as a grouping criterion. Grouping was done according to baseline test results, with 10 animals per group. The animals in the group were fasted but given water overnight. On the second day, mechanical pain values were tested at 2 h, 4 h and 6 h after oral/intragastric administration. The test started at 8 g, with an upper limit of 15 g and a lower limit of 1 g.

[0299] The data were processed according to equation (1) to calculate the PWT 50% value, where Xf is the log value of the final test fibers used in the test, k is a table value (Chaplan et al., 1994), and δ is the mean difference (here 0.224).

PWT 50% (g)=(10[Xf+kδ])/10000  [equation (1)]

[0300] The data were expressed in a form of mean±standard deviation (X±s) and were statistically analyzed using one-way ANOVA and Dunnett's t test (Graphpad prism 6.01).

[0301] The experimental results are shown in FIGS. 2 and 3, which show that the mechanical pain threshold of CCI molded SD rats was significantly increased after single oral administration of Compound 1 and pregabalin. Compound 1 has an effective dose of 3 mg/kg, which is superior to pregabalin having an effective dose of 10 mg/kg.

[0302] Although specific embodiments of the disclosure have been described, those skilled in the art should recognize that a variety of changes and modifications can be made to the disclosure without departing from the scope or spirit of the disclosure. Thus, the present disclosure is intended to cover all such alterations and modifications that fall within the scope defined in the appended claims and their equivalents.