Lipid membrane structures.

摘要

Lipid membrane structures containing, in the lipid membrane thereof, a compound represented by formula (I): <CHEM> wherein R1 represents a hydrogen atom or a fatty acid residue; R2 represents a hydrogen atom or an acyclic hydrocarbon residue; R3 represents an amino group, a guanidino group or an amidino group; and n represents an integer of from 1 to 6; provided that R1 and R2 do not represent hydrogen atoms at the same time, or a salt thereof. The lipid membrane structures exhibit excellent specific affinity for tumor cells and can be delivered preferentially to tumor cells.