Patent ID: 7851632

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 divalent species of a (3-5C)heteroarylene group selected from imidazole, thiazole, oxazole, pyrazole, isoxazole, isothiazole, pyrazine, pyridazine, and pyrimidine; t is 0, 1 or 2; 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 independently selected from hydrogen and (1-4-alkyl); R 7 is selected from hydrogen and (1-4C)alkyl; or a pharmaceutically acceptable salt or solvate or stereoisomer thereof.