Patent ID: 6943160

Claim:
A compound of formula (I): wherein: R 1 is phenyl, naphthyl, a mono or bicyclic heteroaryl group containing up to 3 heteroatoms selected from N, O and S; any of which may be optionally substituted; R 2 represents phenyl or a 5- or 6-membered heteroaryl group containing up to 3 heteroatoms selected from N, O and S, wherein the phenyl or heteroaryl group is substituted by R 3 , and further optional substituents; or R 2 represents an optionally substituted bicyclic aromatic or bicyclic heteroaromatic group containing up to 3 heteroatoms selected from N, O and S; R 3 represents an optionally substituted (C 1-4 )alkoxy, halo, optionally substituted (C 1-6 )alkyl, optionally substituted phenyl, or an optionally substituted 5- or 6-membered heterocyclic ring containing up to 3 heteroatoms selected from N, O and S; or a pharmaceutically acceptable salt thereof.