Patent ID: 8741966

Claim:
A lipid compound of formula (I): wherein R 1 is chosen from a C 10 -C 22 alkenyl having 1-6 double bonds and a C 10 -C 21 alkynyl having 1-6 triple bonds; R 2 and R 3 are the same or different and are chosen from hydrogen and a C 1 -C 6 alkyl group with the proviso that R 2 and R 3 cannot both be hydrogen; and X is chosen from O, S, SO, or SO 2 ; n is 1 or 3; and P 1 is chosen from hydrogen; a C 10 -C 21 alkyl, a C 10 -C 21 alkenyl having 1-6 double bonds, and a C 10 -C 21 alkynyl having 1-6 triple bonds, optionally substituted; a group of formula (II) or formula (III): wherein P 2 , P 3 , and P 4 are chosen from hydrogen, an alkyl, an alkenyl, an alkynyl, optionally substituted; and a phosphonate or a phosphate ester of formula (IV) or a sulphonate or a sulphate ester of formula (V): wherein P 5 is chosen from hydrogen and a C 1 -C 6 alkyl; or a pharmaceutically acceptable salt thereof.