Patent ID: 8263620

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof: A is phenyl or a 5 or 6-membered heteroaryl ring; R 1 is up to two substituents independently selected from halogen, C (1-3) )alkoxy, C (1-3) fluoroalkyl, cyano, C (1-3) fluoroalkoxy, C (1-6) alkyl and C (3-6) cycloalkyl; R 2 is hydrogen, halogen or C (1-4) alkyl; B is selected from one of the following: R 3 is hydrogen or C (1-3) alkyl; R 4 is (CH 2 ) 1-3 CO 2 H; when R 2 or R 4 is alkyl it may be optionally interrupted by oxygen.