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Chemical structures of the isoprenoid abscisic acid (a) and the conjugated linolenic acid stereo- or regioisomers punicic acid- (9Z, 11E, 13E-) octadeca-9, 11, 13-trienoic acid (b) and catalpic acid- (9E, 11E, 13Z-) octadeca-9, 11, 13-trienoic acid (c).
