1713-15-1 2,4-D Iso butyl ester 2,4-D Isobutyl ester 2,4-Dichlorophenoxyacetic acid isobutyl ester 2,4-Dichlorophenoxyacetic acid, isobutyl ester Acetic acid, (2,4-dichlorophenoxy)-, 2-methylpropyl ester Acetic acid, (2,4-dichlorophenoxy)-, isobutyl ester Isobutyl 2,4-D Isobutyl 2,4-dichlorophenoxyacetate NSC409768