2-Butenoic acid, 3-((diethoxyphosphinyl)oxy)-, phenylmethyl ester 63992-57-4 CROTONIC ACID, 3-HYDROXY-, BENZYL ESTER, DIETHYL PHOSPHATE ENT 25,628 Phenylmethyl 3-((diethoxyphosphinyl)oxy)-2-butenoate SD 4893 Shell SD-4893