Patent ID: 6986902

Claim:
A compound of the formula wherein: R 1 is a member selected from the group consisting of hydrogen, hydroxyl, amino, optionally-substituted alkyl and a ligand; Y is a member selected from the group consisting of hydrogen, optionally-substituted alkyl, optionally-substituted cycloalkyl, optionally-substituted aryl and optionally-substituted heteroaryl; X is a member selected from the group consisting of optionally-substituted amino, oxygen, sulfur and a carbon single bond; R 2 is a member selected from the group consisting of C 6 –C 26 alkyl, C 6 –C 26 alkenyl, dialkylglycerolyl, dialkenylglycerolyl, diacylglycerolyl, 1,2-diacyl-sn-glycero-3-phosphoethylenyl, 1,2-dialkoxy-3-aminopropanyl and 1,2-diacyloxy-3-aminopropanyl; R3 is a member selected from the group consisting of hydrogen, hydroxyl, amino, optionally-substituted alkyl and a ligand; n is greater than 1; and i is greater than 1.