Patent ID: 8124617

Claim:
A compound represented by the formula (II): wherein R l is a hydrogen atom; R 2 is a hydrogen atom; R 3 is (1) a hydrogen atom; (2) a C 6-14 aryl group optionally substituted by 1 to 3 substituents selected from (a) a halogen atom, (b) a C 1-6 alkyl group optionally substituted by 1 to 3 halogen atoms, (c) a C 1-6 alkoxy group, and (d) a hydroxy group; (3) a C 1-6 alkyl group optionally substituted by 1 to 3 substituents selected from (a) an amino group optionally substituted by 1 or 2 substituents selected from (i) a C 1-6 alkyl group optionally substituted by 1 to 3 substituents selected from a C 1-6 alkoxy group, a C 6-14 aryloxy group, a carboxyl group and a C 1-6 alkoxy-carbonyl group, and (ii) a C 7-13 aralkyl group, and (b) a hydroxy group; (4) an optionally substituted aromatic heterocyclic group; (5) a formyl group; (6) a carboxyl group; (7) a C 1-6 alkoxy-carbonyl group; or (8) a halogen atom; R 4 is (1) a hydrogen atom; (2) a C 1-6 alkyl group optionally substituted by 1 to 3 substituents selected from (a) a hydroxy group, (b) a carboxyl group, (c) a C 1-6 alkoxy-carbonyl group, (d) a halogen atom, and (e) a cyano group; (3) a cyano group; (4) a carboxyl group; or (5) a C 1-6 alkoxy-carbonyl group; R 5 is a C 1-6 alkyl group substituted by 1 to 3 substituents selected from (a) (2-fluoro)phenyl, (b) a 5- or 6-membered aromatic heterocyclic group, and (c) a 5- or 6-membered non-aromatic heterocyclic group, wherein each of (b) and (c) is optionally substituted by 1 to 3 substituents selected from a halogen atom, a C 1-6 alkyl group, a C 1-6 alkoxy group, a thiol group, a C 1-6 alkyl-carbonyl group, a C 1-6 alkylsulfonyl group, a C 6-14 aryloxy group, a mono-or di-C 1-6 alkyl-amino group); and R 6 is (1) a C 1-6 alkyl group substituted by 1 to 3 substituents selected from (a) a C 6-14 aryl group, (b) a C 3-10 cycloalkyl group, (c) a 5- or 6-membered aromatic heterocyclic group, and (d) a 5- or 6-membered non-aromatic heterocyclic group, wherein each of (a) to (d) is optionally substituted by 1 to 3 substituents selected from a halogen atom, a C 1-6 alkyl group, a C 1-6 alkoxy group, a thiol group, a C 1-6 alkyl-carbonyl group, a C 1-6 alkylsulfonyl group, a C 6-14 aryloxy group, a mono-or di-C 1-6 alkyl-amino group); or (2) a C 3-6 alkyl group optionally substituted by 1 to 3 substituents selected from a C 1-6 alkoxy group and a C 6-14 aryloxy group optionally substituted by 1 to 3 substituents selected from a cyano group and a halogen atom, or a salt thereof.