Patent ID: 7067494

Claim:
A compound or pharmaceutically acceptable salt thereof, wherein the compound is of formula I or II: wherein, Me is methyl; R 1 , R 2 and R 3 are independently selected from the group consisting of: H and C 1 –C 6 acyl; R 4 is selected from the group consisting of: H,Me and a substituted or unsubstituted straight-chain, branched, or cyclic C 1 –C 10 alkyl; and, X is selected from the group consisting of: —CH 2 OR, —COR, —COY, —C(OR)R, —CRCR 2 , and, —CH 2 W; R is selected from the group consisting of: H; a linear, branched, or cyclic, saturated or unsaturated alkyl group containing one to ten carbons optionally substituted with Z; an aromatic group optionally substituted with Z; and, arylalkyl (ArR*) in which an alkyl group (R*) is a linear, branched, or cyclic, and saturated or unsaturated containing one to ten carbons a optionally substituted with Z and an aryl group (Ar) optionally substituted with Z; Z is selected from the group consisting of: —OH, —OR, —O 2 CR, —SH, —SR, —SOCR, —NH 2 , —NHR, —NHR 2 , —NHCOR, —NRCOR, —I, —Br, —Cl, —F, —CN, —CO 2 H, —CO 2 R, —CHO, —COR, —CONH 2 , —CONHR, —CONR 2 , —COSH, —COSR, —NO 2 , —SO 3 H, —SOR, and —SO 2 R; Y is selected from the group consisting of: —OH, —NH 2 , —NHR, —NR 2 , —SH, —SR and —OR; W is selected from the group consisting of: R, F, Cl, Br, I, 13 OSO 3 R, —SO 3 R, —OPO 3 R 2 , —PO 3 R 2 , —SR, —SOR, —SO 2 R, —NR 2 , —NOR, and —NR 3 + ; with each R being the same or different, and wherein for R* and for R when comprising an alkyl, —CH 2 — may be replaced by —O 2 S or NR and CH may be replaced by N; and wherein W=R, R cannot be methyl or ethyl.