Patent ID: 8318940

Claim:
A compound of Formula (I) or a pharmaceutically acceptable salt thereof: wherein in Formula (I): R 1 represents hydrogen; halo; or C 1-3 alkoxy-; R 2 represents hydrogen or hydroxy; Ar represents a group selected from: phenyl, pyridinyl, pyridazinyl, pyrimidinyl, pyrazinyl, thiazolyl, furanyl, imidazolyl and thiophenyl; wherein Ar is substituted by a first substituent R 3 , wherein R 3 represents C 1-5 hydroxyalkyl; Ar is optionally substituted by a second substituent R 4 selected from halo, CF 3 , C 1-3 alkyl, nitro and C 1-3 alkoxy-; and if R 2 is hydrogen then R 5 is hydrogen or C 1-3 alkyl, and if R 2 is hydroxyl then R 5 is hydrogen.