Patent ID: 7858795

Claim:
A compound of formula I: wherein: a is 0 or 1; each R 1 is halo; b is 0 or an integer of from 1 to 2; each R 2 is independently 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 (3-5C)heteroarylene group containing 1 or 2 heteroatoms selected independently from oxygen, nitrogen and sulfur; wherein the heteroarylene group is 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)alkyl and (1-4C)alkoxy; t is 0, 1 or 2; p is 0, 1 or 2; each R 6 independently represents halo or —OR 6a , where R 6a is hydrogen or (1-4C)alkyl; and X 1 is selected from (1-3C)alkylene, —C(O)(1-3C)alkylene, (1-3C)alkyleneC(O)—, —SO 2 —, —SO 2 (1-3C)alkylene and (1-3C)alkyleneSO 2 —; where the alkylene group in any X 1 is optionally substituted with 1 or 2 substituents independently selected from (1-4C)alkyl and —NR Xa R Xb ; wherein R Xa and R Xb are independently selected from hydrogen and (1-4alkyl); R 7 is selected from hydrogen and (1-4C)alkyl; wherein each alkyl group in R 6a is optionally substituted with 1 to 5 fluoro substituents; or a pharmaceutically acceptable salt or stereoisomer thereof.