Patent ID: 7625926

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof: wherein, R 1 is aryl, heteroaryl, acrylaryl, acrylheteroaryl, heterocycloalkenyl, or carbocyclo, which is optionally substituted with one or more substituents selected from the group consisting of C 1-5 alkyl, hydroxy, C 1-5 alkoxy, halogen, trifluoromethyl, nitro and amino; R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 and R 11 are each independently hydrogen, hydroxy, halogen, nitro, C 1-5 alkyl or alkoxy, R 6 and R 11 being optionally fused together to form a 4 to 8-membered ring; m and n are each independently an integer ranging from 0 to 4; and X is CH 2 , O or S.