Patent ID: 8563733

Claim:
An optically active compound of formula (III): wherein ring A is a benzene ring optionally having 1 to 3 substituent(s), which may be the same or different, are each independently selected from (a) a halogen atom, (b) a cyano, (c) a nitro, (d) an alkyl optionally having 1 to 3 substituent(s) selected from a halogen atom, a C 1-6 alkoxy, a C 1-6 alkoxy carbonyl and a carbamoyl, (e) an alkoxy optionally having 1 to 3 substituent(s) selected from a halogen atom, a C 1-6 alkoxy, a C 1-6 alkoxycarbonyl and a carbamoyl, (f) an aryl, and (g) an aryloxy, R 1 , R 2 and R 3 are each a hydrogen atom; an alkyl group optionally having 1 to 3 substituent(s) selected from a halogen atom, a C 1-6 alkoxy, a C 1-6 alkoxycarbonyl and a carbamoyl; an alkoxy group optionally having 1 to 3 substituent(s) selected from a halogen atom, a C 1-6 alkoxy, a C 1-6 alkoxycarbonyl and a carbamoyl; or a di-C 6-14 arylamino, R 4 is an aryl or aralkyl group, and * is an asymmetric center or their pharmaceutically acceptable alkali and alkaline earth salts.