cis-8,11,14-Eicosatrienoic Acid Ethyl Ester-d5 is the isotope labelled analog of cis-8,11,14-Eicosatrienoic Acid Ethyl Ester (E477920); the ethyl ester derivative of cis-8,11,14-Eicosatrienoic Acid (E477930) which is a fatty acid with selective tumoricidal activity.