2,4,5-Trichlorophenoxypropionic acid, butoxyethyl ester 2-Butoxyethyl 3-(2,4,5-trichlorophenoxy)propionate 30387-70-3 EINECS 250-169-1 Propionic acid, 3-(2,4,5-trichlorophenoxy)-, 2-butoxyethyl ester