Patent ID: 8623855

Claim:
A compound represented by formula (I) or a pharmaceutically acceptable salt thereof, wherein: R 1 is 1 to 3 substituents independently selected from the group consisting of hydrogen, halogen, trifluoromethyl, cyano, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 3 -C 6 cycloalkyl, hydroxyl, C 1 -C 6 alkoxy, benzyloxy and —OCOR 7 ; R 2 is 1 to 3 substituents independently selected from the group consisting of hydrogen, halogen, trifluoromethyl, cyano, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 3 -C 6 cycloalkyl, hydroxyl, C 1 -C 6 alkoxy, C 6 -C 10 aryloxy, (C 6 -C 10 aryl)methoxy and —OCOR 7 ; R 3 is 1-3 substituents independently selected from the group consisting of hydrogen, halogen, trifluoromethyl, cyano, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 3 -C 6 cycloalkyl, C 1 -C 6 alkoxy and benzyloxy; R 4 is selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 2 -C 6 alkenyl and C 3 -C 6 cycloalkyl; R 5 is selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 2 -C 6 alkenyl and C 3 -C 6 cycloalkyl; R 6 is hydrogen or —COR 7 ; R 7 is C 1 -C 10 alkyl, phenyl or phenyl substituted with at least one substituent selected from the group consisting of halogen, trifluoromethyl, cyano, hydroxyl, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 3 -C 6 cycloalkyl, C 1 -C 6 alkoxy, phenoxy and benzyloxy; m is 0, 1, 2 or 3; and n is 1, 2 or 3.