Patent ID: 7560475

Claim:
A compound represented by formula (I) wherein R 1 and R 2 each independently represents a hydrogen atom, C1-8 alkyl, a halogen atom, C1-4 alkoxy, nitro, trihalomethyl, trihalomethoxy, trihalomethylthio, cyano, C1-4 alkylthio or NR 7 R 8 , in which R 7 and R 8 each independently represents a hydrogen atom or C1-4 alkyl; R 3 represents C1-8 alkyl which may be substituted with a 1-3 halogen atom(s) or phenyl; R 4 represents a hydrogen atom or C1-8 alkyl; R 5 and R 6 each independently represents a hydrogen atom or C1-4 alkyl, or R 5 and R 6 may be together with their neighboring carbon atom to form a carbocyclic ring; X represents a sulfur atom, an oxygen atom or a nitrogen atom which may have a substituent(s); ring A represents 4-(trifluoromethyl)piperidin-1-yl or 3,4-dihydro-1H-isoquinolin-2-yl, or a salt thereof.