(all-Z)-6,9,12,15,18-Heneicosapentaenoic Acid Ethyl Ester-d5 is the isotope labelled analog of (all-Z)-6,9,12,15,18-Heneicosapentaenoic Acid Ethyl Ester (H245610); a fatty acid ester from marine oils used for prophylaxis and treatment of hypertension, hypertriglyceridemia, hypercholesterolemia.