(3,4-Dichlorophenoxy)acetic acid 3,4-D 3,4-DA 3,4-Dichlorophenoxyacetic acid 4-06-00-00954 (Beilstein Handbook Reference) 588-22-7 Acetic acid, (3,4-dichlorophenoxy)- BRN 1969638 EINECS 209-612-4 NSC 39017 NSC 525057