DOCP (2-((2,3-Bis(oleoyloxy)propyl)dimethylammonio)ethyl hydrogen phosphate) is a lipid characterized by an opposite charge orientation compared to traditional phosphatidylcholine (PC) lipids, featuring quaternary ammonium near the bilayer interface and phosphate groups projecting into the aqueous environment. This unique structure of iPC lipids presents an excellent opportunity to investigate the biophysical characteristics and biological activities influenced by the reversal of surface charges on bilayers.