Patent ID: 8192753

Claim:
A lipid of formula (I): Cation-spacer2-Y-spacer1-amphiphilic component (I) wherein (a) the cation is a morpholine group, (b) spacer 1 and spacer 2 are each, independently of one another, a linear C 1 to C 8 alkyl having 0 to 4 hydroxyl groups, (c) Y is absent or —(C═O)—O—; —(C═O)—NH—; —NH—(C═O)—O—; —O—; —NH—; —CH═N—; —O—(O═C)—; —S—; —(O═C)—; —NH—(O═C)—; —O—(O═C)—NH—, —N═CH— or —S—S—, (d) the amphiphilic component is a compound according to formula (II): wherein R 1 and R 2 independently are C 8 -C 30 alkyl or acyl chains having 0, 1 or 2 ethylenically unsaturated bonds, and X is absent or —O—(C═O); —NH—(C═O)—; —S—(C═O)—; —O—; —NH—; —S—; —(O═C)—O—; —S—(O═C)—; —NH—(O═C)—; —N═CH— or —S—S—.