Patent ID: 7285572

Claim:
A compound represented by the following formula (1), an optically active form thereof, or a pharmaceutically acceptable salt thereof: ring A is a C 3-6 cycloalkyl group, wherein R 1 is a C 1-6 alkyl group or R A O—C(═O)—X—(O)n-, wherein R A is a hydrogen atom, a C 1-6 alkyl group or R B O—C(═O)O—C 1-6 alkylene- (wherein R B is a C 1-6 alkyl group or a C 3-6 cycloalkyl group), X is a C 1-6 alkylene group, a C 2-4 alkenylene group, a C 2-4 alkynylene group, (wherein m is an integer of 0 to 6) or and n is 0 or 1, R 2 is a carboxy-C 1-6 alkyl group, a C 1-6 alkoxy-carbonyl-C 1-6 alkyl group, a carbamoyl-C 1-6 alkyl group, a C 1-7 acylamino-C 1-6 alkyl group, a hydroxycarbamoyl group, a C 1-6 alkylsulfonyl-carbamoyl group, an oxalo group, a phosphoric acid group optionally esterified by a C 1-6 alkyl group, R A O—C(═O)— (R A is as defined above) or a 5- or 6-membered heterocyclic residue having 1 to 4 hetero atoms selected from the group consisting of a nitrogen atom, an oxygen atom and a sulfur atom (said heterocyclic residue is optionally substituted by an oxo group), R 3 and R 4 are the same or different and each is a hydrogen atom, a cyano group, a halogen atom, a C 1-6 alkyl group, a C 1-6 alkoxy group, a halo C 1-6 alkyl group or a halo C 1-6 alkoxy group, R 5 is a C 1-6 alkyl group or a C 3-6 cycloalkyl group, R 6 is a hydrogen atom or R C (wherein R C is a C 1-7 acyl group optionally substituted by a carboxyl group), R 7 , R 8 and R 9 are the same or different and each is a hydrogen atom, a C 1-6 alkyl group, a C 2-4 alkenyl group, a halogen atom, a halo C 1-6 alkyl group, a C 1-6 alkoxy group, a halo C 1-6 alkoxy group, or a carboxyl group, or the adjacent R 7 and R 8 are joined to form —CH═CH—CH═CH—, provided that (1) when ring A is a group of the formula (a) and R 1 is a C 1-6 alkyl group, then R 6 is R C , (2) when ring A is a group of the formula (b) and R 2 is a carboxyl group or a C 1-6 alkoxy-carbonyl group, then R 7 is a C 2-4 alkenyl group, (3) when ring A is a group of the formula (b) and R 2 is a hydroxycarbamoyl group, then R 3 is a hydrogen atom, or (4) when ring A is a group of the formula (a), R 1 is R A O—C(═O)—X—(O)n- and X is then n is 0.