19398-13-1 2-(2,4,5-Trichlorophenoxy)propionic acid, 2-butoxyethyl ester 2-Butoxyethyl 2-(2,4,5-trichlorophenoxy)propionate Caswell No. 739A EINECS 243-028-0 EPA Pesticide Chemical Code 082553 Silvex, 2-butoxyethyl ester