trimethylammonium 2,4-dichlorophenoxyacetate 2,4-D Trimethylamine salt 2,4-Dichlorophenoxyacetic acid trimethylamine salt Acetic acid, (2,4-dichlorophenoxy)-, compd. with N,N-dimethylmethanamine (1:1) Caswell no. 315af Einecs 229-132-9 Epa pesticide chemical code 030036