Patent ID: 8222245

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, optionally substituted phenyl, 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 a 7 membered saturated ring selected from the following: R 3 is hydrogen or (CH 2 ) 1-4 CO 2 H; R 4 is hydrogen or C (1-3) alkyl optionally interrupted by oxygen.