The molecule is a long-chain fatty acid ethyl ester resulting from the formal condensation of the carboxy group of stearidonic acid with the hydroxy group of ethanol. It derives from an all-cis-octadeca-6,9,12,15-tetraenoic acid.
ethyl (6Z,9Z,12Z,15Z)-octadeca-6,9,12,15-tetraenoate