Patent ID: 7745462

Claim:
A compound of formula I: in free or salt form, where R 1 is hydroxy and R 2 is hydrogen; G is a group having the formula Ib: C˜C denotes C═C or CH—CH; R 7 and R 8 are both hydrogen; R 9 and R 10 are independently selected from the group consisting of hydrogen and C 1 -C 10 alkyl, or R 9 and R 10 together form a C 3 -C 10 cycloalkyl or C 3 -C 10 cycloalkenyl, and in either case wherein R 9 and R 10 are optionally substituted by C 1 -C 10 alkyl; and R 11 is a C 3 -C 15 carbocyclic group or C 1 -C 10 alkyl substituted by a C 3 -C 15 carbocyclic group.