Deulinoleate ethyl (also known as di-deuterated ethyl linoleate, di-deuterated linoleic acid ethyl ester, 11,11-d-ethyl linoleate, or ethyl 11,11-d-linoleate) is an experimental, orally-bioavailable synthetic deuterated polyunsaturated fatty acid (PUFA), a part of reinforced lipids.  It is an isotopologue of linoleic acid, an essential omega-6 PUFA. The deuterated compound, while identical to natural linoleic acid except for the presence of deuterium, is resistant to lipid peroxidation which makes studies of its cell-protective properties worthwhile.