2,4-Dichlorophenoxyacetic acid polyethyleneglycol ester 53404-02-7 Caswell No. 315AX EPA Pesticide Chemical Code 030068 Poly(oxy-1,2-ethanediyl), alpha-((2,4-dichlorophenoxy)acetyl)-omega-hydroxy- alpha-((2,4-Dichlorophenoxy)acetyl)-omega-hydroxypoly(oxy-1,2-ethanediyl)