Patent ID: 6939869

Claim:
A compound of formula (I): or a pharmaceutically acceptable salt thereof, wherein X′ is not present or represents NH; when X′ is not present, R 11 is not present; and when X′ represents NH, R 11 represents a C 1 -C 12 alkylene moiety optionally substituted with C 1 -C 4 alkyl; R 1 ′ represents O or NH; R 2 is selected from the group consisting of: hydrogen; halogen; cyano; nitro; phenoxy; and C 1 -C 12 alkyl, C 1 -C 12 alkoxy or C 2 -C 12 alkenoxy optionally and independently substituted with halogen, cyano, phenyl or C 1 -C 3 alkoxy; R 3 is selected from the group consisting of hydrogen, alkyl, alkenyl, alkenylidene, and R form or S form of hydroxy or alkoxy; R 4 and R 5 independently represent: hydrogen; halogen; cyano; phenoxy; and C 1 -C 6 alkyl or C 1 -C 6 alkoxy optionally and independently substituted with halogen, nitro, cyano, phenyl or C 1 -C 3 alkoxy; and R 6 , R 7 , R 8 , R 9 and R 10 independently represent: hydrogen; halogen; amino; cyano; hydroxy; nitro; phenoxy; phenyl; and C 1 -C 12 alkyl or C 1 -C 12 alkoxy or C 2 -C 12 alkenoxy optionally and independently substituted with halogen, amino, cyano, hydroxy, phenyl or C 1 -C 3 alkoxy.