ines, N-glutaryl-1,2-diacyl-sn-glycero-3-phosphoethanolamines, N-dodecanyl-1,2-diacyl-sn-glycero-3-phospho-ethanolamines, fatty acids, such as stearic acid, and steroids, such as cholesterol. [0300] In other preferred embodiments, L is a protein which comprises albumin.