(Z)-Octadec-6-enoic acid 593-39-5 delta-5-octadecylenic acid 5-heptadecylene-1-carboxylic acid 6-octadecylenic acid 6Z-octadecenoic acid LMFA01030066 Petroselic acid P8750_SIGMA (6Z)-Octadecenoic acid C08363 Petroselinic acid cis-6-Octadecenoic acid P8875_SIGMA (6Z)-octadec-6-enoic acid (Z)-6-octadecenoic acid CHEBI:28194 cis-Delta(6)-octadecenoic acid (6Z)-6-Octadecenoic acid