Patent ID: 8293754

Claim:
A compound represented by the following formula (I) in which R 1 is hydrogen, C 1-6 alkyl, C 1-6 alkoxyC 1-6 alkyl or C 1-6 haloalkyl containing 1-6 halogen atoms, R 2 is hydrogen, C 1-6 alkyl, phenylC 1-6 alkyl or amino, R 3 is C 2-6 alkyl, C 2-6 alkenyl, carbamoylC 1-6 alkyl, aminoC 1-6 alkyl, C 1-6 alkylaminoC 1-6 alkyl, di-(C 1-6 alkyl)aminoC 1-6 alkyl, C 1-6 alkylthio or Y—X— group, or R 2 and R 3 may together form tetramethylene, X is a direct bond, or CH 2 , CH(OH), CH(C 6 H 5 ), CO, CH 2 CH 2 , CH 2 CO, COCH 2 , S, O or NH and Y is an aromatic carbocyclic group, aromatic heterocyclic group, 4-7-membered cycloalkyl group, 4-7-membered cycloalkenyl group, 5-7-membered saturated heterocyclic group containing 1 or 2 nitrogen atoms, or 5-7-membered saturated heterocyclic group forming a condensed ring with 5 or 6-membered saturated cyclic group and containing 1 or 2 nitrogen atoms, all of these groups optionally containing 1-3 substituents selected from the group consisting of halogen atom, C 1-6 alkyl, C 1-6 haloalkyl containing 1-6 halogen atoms, C 1-6 haloalkyloxy containing 1-6 halogen atoms, C 1-6 haloalkylthio containing 1-6 halogen atoms, C 1-6 alkoxy, C 1-6 alkylthio, C 1-4 alkylenedioxy, carboxyl, C 1-6 alkoxycarbonyl, oxo, amino, nitro and phenyl, Z is S or O, and n is 0 or an integer of 1-4, with the proviso that a case wherein R 1 is methyl, R 2 is hydrogen, R 3 is benzyl, Z is O and n is 0 is excluded, or a salt thereof.