1,2-Dioctadecanoyl-sn-glycero-3-phosphoethanolamine 1,2-Distearoylphosphatidylethanolamine 1-((((2-Aminoethoxy)hydroxyphosphinyl)oxy)methyl)-1,2-ethanediyl octadecanoate 4537-76-2 DC18PE DSPE Distearoly-L-phosphatidylethanolamine Octadecanoic acid, 1-((((2-aminoethoxy)hydroxyphosphinyl)oxy)methyl)-1,2-ethanediyl ester