Patent ID: 7109201

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof: in which R a is a group of formula (i): wherein P 2 is phenyl, naphthyl, or pyridyl; P 3 is phenyl, naphthyl or or pyridyl; R 1 is NR 4 COR 5 , NR 4 SO 2 R 5 , CH 2 NR 4 SO 2 R 5 , CH 2 NR 4 COR 5 or CH 2 NR 4 CO 2 R 5 where R 4 and R 5 are independently hydrogen or C 1-6 alkyl; R 2 and R 3 are independently halogen, C 1-6 alkyl, C 3-6 cycloalkyl, C 1-6 alkoxy, COC 1-6 alkyl, CF 3 , cyano or NR 6 R 7 where R 6 and R 7 independently hydrogen or C 1-6 alkyl; b and c are independently 0, 1, 2 or 3; Y is a single bond, CH 2 or NH; W is —(CR 9 R 10 )- where t is 2, 3 or 4 and R 9 and R 10 are independently hydrogen or C 1-6 alkyl or W is a group CH═CH; R b is hydrogen, halogen, C 1-6 alkyl, CF 3 , COC 1-6 alkyl, cyano or C 1-6 alkoxy; R c is hydrogen or C 1-6 alkyl.