Patent ID: 7186703

Claim:
A compound of the formula I: or a pharmaceutically acceptable salt thereof, wherein: R1 and R2 are the same or different, saturated or unsaturated aliphatic chain having from 2 to 30 carbon atoms; R3 is A-[CH 2 ] m -B[CH 2 ] n —C—[CH 2 ] p -D, wherein m, n and p are each independently zero or an integer from 1 to 12, and A is carbonyl or oxygen, B is oxygen or a covalent bond, C is oxygen or a covalent bond, D is a covalent bond with the proviso that no two oxygen atoms are directly connected to each other; and one of Z 1 and Z 2 is absent and the other together with the phospho group forms a phospho ester of glycerol, choline, ethanolamine, inositol, or serine.