(6Z,9Z,12Z,15Z)-octadeca-6,9,12,15-tetraenoic acid 111174-40-4 20290-75-9 CHEBI:32389 all-cis-octadeca-6,9,12,15-tetraenoic acid (6Z,9Z,12Z,15Z)-Octadecatetraenoic acid C16300 6Z,9Z,12Z,15Z-octadecatetraenoic acid LMFA01030357 Stearidonic acid