Patent ID: 7935719

Claim:
A compound of formula I wherein X is CO, CH 2 or SO m ; n is an integer of 1, 2 or 3; m is 0 or an integer of 1, or 2; R 1 and R 2 are taken together with the atom to which they are attached to form an optionally substituted 4- to 7-membered ring optionally containing one or two additional heteroatoms selected from N, O or S R 3 and R 4 are taken together with the atom to which they are attached to form an optionally substituted fused polycyclic 9- to 15-membered ring system optionally containing one to three additional heteroatoms selected from N, O or S; R 5 and R 6 are each independently H, halogen, OR 8 or an alkyl, alkenyl, alkynyl, cycloalkyl, cycloheteroalkyl, aryl or heteroaryl group each optionally substituted; R 8 is H or an optionally substituted alkyl group; or a stereoisomer thereof or a pharmaceutically acceptable salt thereof.