Patent ID: 7560469

Claim:
A compound of formula I: wherein: a is 0 or 1; R 1 is halo; b is 0 or 1; R 2 is halo; m is 0 or 1; R 4 is selected from hydrogen; and (1-4C)alkyl; s is 0, 1 or 2; Ar 1 represents a phenylene group substituted with (R 5 ) q where q is 0 or an integer from 1 to 4 and each R 5 is selected independently from halo, hydroxy, (1-4C)allkyl and (1-4C)alkoxy; t is 0, 1 or 2; n is 2; p is 0 or 1; and R 7 and R 8 are independently hydrogen or (1-4C)alkyl; wherein each alkyl and alkoxy group in R 5 , R 7 , and R 8 is optionally substituted with 1 to 5 fluoro substituents; or a pharmaceutically acceptable salt or stereoisomer thereof.