Patent ID: 8759390

Claim:
A compound of formula (I): or a stereoisomer or a pharmaceutically acceptable salt thereof, wherein: R 2 is H, or C 1-4 alkyl; R 3 and R 3 ′ are independently H, C 1-4 alkyl, C 1-4 alkoxy, halo, or haloC 1-4 alkyl; or R 3 and R 3 ′, when attached to neighboring carbons, taken together form —CH═CH—CH═CH—; R 4 is H or C 1-4 alkyl; W 1 is C—Z′; W 2 is C—Y′; W 3 is C—X; X is H, C 1-4 alkyl, C 1-4 alkoxy, halo or haloC 1-4 alkyl; Y′ is H, C 1-4 alkyl, C 1-4 alkoxy, halo, haloC 1-4 alkyl or NO 2 ; Y is H, C 1-4 alkyl, halo, halo-C 1-4 -alkyl or NO 2 ; Z and Z′ are independently H or halo; or Y and Z, Y′ and Z′, Y and X, or Y′ and X are taken together to form —CH═CH—CH═CH—; provided that: (1) if W 1 , W 2 and W 3 are all CH, then Y cannot be H; (2) if W 1 , W 2 and W 3 are all CH and Z is Cl, then Y is Cl; and (3) if X is F then one of Y or Y′ is not H.