Patent ID: 7629385

Claim:
A composition comprising a compound having formula 1 and a pharmaceutically acceptable excipient: wherein is a single bond, a double bond or a triple bond; X is selected from NH, NHCO, NHCONH, NHCO 2 and NHSO 2 ; R 1 is OR, NR 2 or OPO 3 2− or OCO(C 1-4 alkyl), wherein R is H or C 1-4 alkyl; R 2 is NH 2 , NH(C 1-4 alkyl), OH, H, halogen, O, N(C 1-4 alkyl) 2 or O(C 1-4 alkyl), provided that if R 2 is O then is a double bond, in all other cases is a single bond; R 3 is a C 9-25 hydrocarbon group, wherein one or more hydrogens are optionally replaced by halogen; R 4 is a group of the following formula 2: wherein n 21 is an integer from 1 to 3, with the proviso that n 21 is not 1 if X is NH, NHCONH or NHCO 2 ; n 22 is an integer of 1 or 2; n 23 is an integer from 1 to 5; each R 22 is independently H or C 1-3 alkyl; R 23 is O—R 21 or NH—R 24 ; R 21 is C 1-4 alkyl, CO(C 1-4 alkyl) or H; and R 24 is C 1-4 alkyl, CO(C 1-4 alkyl) or H; or a pharmaceutically acceptable salt thereof.