Patent ID: 8507530

Claim:
A compound represented by the following formula (I) or a salt thereof: wherein R 1 represents a hydrogen atom, a halogen atom, an amino group, R 11 —NH— wherein R 11 represents a C 1-6 alkyl group, a hydroxy C 1-6 alkyl group, a C 1-6 alkoxy C 1-6 alkyl group or a C 1-6 alkoxycarbonyl C 1-6 alkyl group, R 12 —(CO)—NH— wherein R 12 represents a C 1-6 alkyl group or a C 1-6 alkoxy C 1-6 alkyl group, a C 1-6 alkyl group, a hydroxy C 1-6 alkyl group, a cyano C 1-6 alkyl group, a C 1-6 alkoxy group, or a C 1-6 alkoxy C 1-6 alkyl group or a partial structure represented by the formula: R 2 represents a hydrogen atom, a C 1-6 alkyl group, an amino group or a di C 1-6 alkylamino group or a partial structure represented by the formula: one of X and Y is a nitrogen atom while the other is a nitrogen atom or an oxygen atom; ring A represents a substituted or unsubstituted benzene ring wherein the substitution is a halogen atom or 1 or 2 C 1-6 alkyl groups; Z represents a single bond, a methylene group, an ethylene group, an oxygen atom, a sulfur atom, —CH 2 O—, —OCH 2 —, —NH—, —CH 2 NH—, —NHCH 2 —, —CH 2 S— or —SCH 2 —; R 3 represents a pyridine ring which may have 1 or 2 substituents selected from the group consisting of a halogen atom, a cyano group, a C 1-6 alkyl group, a C 1-6 alkoxy group, a C 1-6 alkoxycarbonyl group, a C 3-8 cycloalkyl group, a C 2-6 alkenyl group, and a C 2-6 alkynyl group; and R 4 represents a hydrogen atom or a halogen atom; provided that either R 1 or R 2 represents a partial structure represented by the formula: