1,2-Dimethyl-1,2-ethanediyl 9,12,15-octadecatrienoate 2,3-Butanediol bis(9,12,15-octadecatrienoate) 84006-24-6 9,12,15-Octadecatrienoic acid, 1,2-dimethyl-1,2-ethanediyl ester