The present invention provides a novel compound having an excellent β-lactamase inhibitory effect. The present invention provides: a compound which has an excellent β-lactamase inhibitory effect, and is represented by formula (1a), (1b) or (11); or a pharmaceutically acceptable salt thereof. This compound provides a prophylactic or therapeutic agent effective for bacterial infections when used in combination with β-lactam-based drugs or used as a single agent. The present invention also provides a prophylactic or therapeutic agent effective for treating various diseases, by being used in combination with β-lactam-based drugs.

The present invention provides a novel compound having an excellent β-lactamase inhibitory effect. The present invention provides: a compound which has an excellent β-lactamase inhibitory effect, and is represented by formula (1a), (1b) or (11); or a pharmaceutically acceptable salt thereof. This compound provides a prophylactic or therapeutic agent effective for bacterial infections when used in combination with β-lactam-based drugs or used as a single agent. The present invention also provides a prophylactic or therapeutic agent effective for treating various diseases, by being used in combination with β-lactam-based drugs.

Required are: a compound having high affinity for an emopamil binding protein; and a method for activating or inhibiting the emopamil binding protein, using such a compound. According to the present invention, provided is an emopamil binding protein binding agent comprising an alkyl ether derivative represented by the following formula [1] or a salt thereof: ##STR00001## wherein R.sup.1 and R.sup.2, which are the same or different, each represent a hydrogen atom, a halogen atom, an optionally substituted C.sub.1-6 alkyl group, an optionally substituted aryl group, etc.; R.sup.3 represents an optionally protected hydroxyl group, etc.; and m and n, which are the same or different, each represent an integer of 1 to 6.

Required are: a compound having high affinity for an emopamil binding protein; and a method for activating or inhibiting the emopamil binding protein, using such a compound. According to the present invention, provided is an emopamil binding protein binding agent comprising an alkyl ether derivative represented by the following formula [1] or a salt thereof: ##STR00001## wherein R.sup.1 and R.sup.2, which are the same or different, each represent a hydrogen atom, a halogen atom, an optionally substituted C.sub.1-6 alkyl group, an optionally substituted aryl group, etc.; R.sup.3 represents an optionally protected hydroxyl group, etc.; and m and n, which are the same or different, each represent an integer of 1 to 6.

The present invention relates to a pharmaceutical composition for preventing or treating lupus, containing a compound represented by a formula I, an optical isomer thereof or a pharmaceutically acceptable salt thereof as an effective component, as well as a treatment method using the compound, and use of the compound in the manufacture of a medicament for treating lupus. The pharmaceutical composition according to the present invention shows an excellent effect of preventing or treating lupus.

The present invention relates to a pharmaceutical composition for preventing or treating lupus, containing a compound represented by a formula I, an optical isomer thereof or a pharmaceutically acceptable salt thereof as an effective component, as well as a treatment method using the compound, and use of the compound in the manufacture of a medicament for treating lupus. The pharmaceutical composition according to the present invention shows an excellent effect of preventing or treating lupus.

Provided herein are compounds, pharmaceutical compositions comprising the compounds, methods of preparing the compounds, and methods of using the compounds and compositions in treating diseases or disorders in a subject where the subject is in need of an inhibitor of MEK where the compound is according to formula where R.sup.1, R.sup.2, R.sup.2a, R.sup.3, R.sup.3a, and X are as described herein. ##STR00001##

The present disclosure relates to a pharmaceutical composition for preventing or treating statin-induced adverse effects or a pharmaceutical composition for co-administration with statin, the pharmaceutical composition containing, as an active ingredient, at least one selected from the group consisting of an isoprenoid-based compound, zaragozic acid, terbinafine, and ketoconazole. The pharmaceutical composition according to the present disclosure may prevent and/or treat adverse statin effects that can be induced by statin, that is, can be induced at any time by oxisterols present at abnormal levels in the body. The pharmaceutical composition can not only treat but also prevent the adverse effects of various statin therapeutics whose use has recently increased rapidly, and thus it is expected that the pharmaceutical composition can be widely used for various diseases and the utilization thereof can further be increased.

The present disclosure relates to a pharmaceutical composition for preventing or treating statin-induced adverse effects or a pharmaceutical composition for co-administration with statin, the pharmaceutical composition containing, as an active ingredient, at least one selected from the group consisting of an isoprenoid-based compound, zaragozic acid, terbinafine, and ketoconazole. The pharmaceutical composition according to the present disclosure may prevent and/or treat adverse statin effects that can be induced by statin, that is, can be induced at any time by oxisterols present at abnormal levels in the body. The pharmaceutical composition can not only treat but also prevent the adverse effects of various statin therapeutics whose use has recently increased rapidly, and thus it is expected that the pharmaceutical composition can be widely used for various diseases and the utilization thereof can further be increased.

The invention provides compounds of formula I and II and salts thereof, wherein R.sup.1, R.sup.2, Y, R.sup.3, and R.sup.4 have any of the meanings described in the specification, as well as compositions comprising such compounds and salts, and methods for treating cancer using such compounds and salts.

##STR00001##