1320-18-9 2,4-D 2-butoxymethylethyl ester 2,4-D PGBE 2,4-D esters 2,4-D propylene glycol butyl ether ester 2,4-D, PROPYLENE GLYCOL BUTYL ETHER ESTER 2,4-Dichlorophenoxy, 2-butoxymethylethyl ester 2,4-Dichlorophenoxyacetic acid propylene glycol butyl ether ester Acetic acid, (2,4-dichlorophenoxy)-, 2-butoxymethylethyl ester Acetic acid, (2,4-dichlorophenoxy)-, butoxy propylene deriv Acetic acid, (2,4-dichlorophenoxy)-, propylene glycol butyl ester Acetic acid, 2,4-dichlorophenoxy-, butoxypropyl ester DuPont Lawn Weeder Esteron 99 Weed Killer Esteron 99 Weed Killer Concentrate Esteron Ten-Ten HSDB 3426 Propylene glycol butyl ether 2,4-dichlorophenoxyacetate Verton 2D Verton 4D