3-Tridecylhexadecanoic Acid Ethyl-d5 Ester is labelled 3-Tridecylhexadecanoic Acid Ethyl Ester (T775010), the ethyl ester of 3-Tridecylhexadecanoic Acid (T775005) which is a derivative of 14-Heptacosanone (H268520). It is used in the development of Vizantin (an immunostimulant) and displays cytotoxic activity toward Vero cells.