Patent ID: 8173684

Claim:
A compound represented by the formula (I): wherein R 1 is lower alkyl, cycloalkyl or aromatic hydrocarbon ring, each of which is optionally substituted with one or more substituents; R 2 is halogen atom, lower alkyl, halo(lower)alkyl or lower alkoxy; and R 3 is (1) a group represented by the formula: wherein R 4 is lower alkyl, lower alkoxy, cycloalkyl, aromatic hetero ring, non-aromatic hetero ring or aromatic hydrocarbon ring, each of which is optionally substituted with one or more substituents; (2) a group represented by the formula: wherein R 5 is lower alkyl, cycloalkyl, aromatic hydrocarbon ring, aromatic hetero ring or non-aromatic hetero ring, each of which is optionally substituted with one or more substituents; (3) a group represented by the formula: wherein R 6 is lower alkyl, cycloalkyl, aromatic hydrocarbon ring or non-aromatic hetero ring, each of which is optionally substituted with one or more substituents; or (4) a group selected from halogen atom, carboxy, hydroxy and lower alkoxy, or a salt thereof.