Cholesteryl oleate-d 7 -1 is deuterium labeled Cholesteryl oleate. Cholesteryl oleate is an ester compound formed from Cholesterol and Oleic acid , which is involved in lipid transport, storage and cell membrane formation in living organisms. Cholesteryl oleate may serve as a potential biomarker for prostate cancer. Cholesteryl oleate can also prepare cationic solid lipid nanoparticles (SLNs) for efficient gene silencing.