Patent ID: 7803808

Claim:
A compound having the following formula: wherein: x represents a direct bond, —CH 2 —, —S—CH 2 —, —CH 2 —S— or —S(═O)—CH 2 —; or —CHR 5 -x-CHR 6 — represents R 1 represents ═O or (H,H); R 2 represents OH or OMe; R 3 represents H, OH or OMe; R 4 represents a structural fragment selected from groups A, B, C, D, E and F, in which the wavy line indicates the position of attachment of the fragment, R 7 represents H or OH and R 8 represents H, OH, halo, thiol or C 1-4 alkyl; or R 4 alternatively represents a 5- to 7-membered heterocycle containing one or more heteroatoms selected from the group consisting of O, S and N, which heterocycle is optionally substituted with one or more substituents selected from C 1-4 alkyl, OH, F and Cl; and R 5 and R 6 are each independently H or OH, or pharmaceutically acceptable salts thereof.