Patent ID: 7582651

Claim:
A compound represented by the formula wherein Ring A represents a pyridine ring which may have one or two C 1-4 alkly groups, X represents a nitrile group, Y represents —CH═CH— or —(CH 2 ) 2 , R 1 represents (1) a C 5-7 cycloalkyl group optionally fused with a benzene ring, (2) a C 7-19 aralkyl group, (3) a 5- or 6-membered heterocyclic ring-C 1-4 alkyl group or (4) a C 6-14 aryloxy-C 1-4 alkyl group, each of which may have 1 to 4 substituents selected from a halogen atom, a C 1-4 alkyl group, a mono-, di- or tri-halogeno-C 1-4 alkyl group and a C 1-4 alkoxy group, and one of R 2 and R 3 is a hydrogen atom or a C 1-4 alkyl group, and the other is a C 6-14 aryl group, a C 7-19 aralkyl group, a C 3-10 cycloalkyl group, a tetrahydropyranyl group, a pyranyl group or a pyridyil group or a C 1-6 alkyl group, each of which may have 1 to 4 substituents selected from a halogen atom, a C 1-4 alkyl group, a mono-, di- or tri- halogeno-C 1-4 alkyl group, a C 1-4 alkoxy group, a C 1-4 alkoxy-carbonyl group, a cyano group, a C 1-4 alkyl-carbonylamino group and a hydroxyl group or a salt thereof.