2-Mercaptoethyl (9Z,12Z)-octadeca-9,12-dienoate 2-Mercaptoethyl linoleate 52147-29-2 9,12-Octadecadienoic acid (9Z,12Z)-, 2-mercaptoethyl ester 9,12-Octadecadienoic acid (Z,Z)-, 2-mercaptoethyl ester EINECS 257-690-3