2-Butenoic acid, 3-((dimethoxyphosphinyl)oxy)-, (3-nitrophenyl)methyl ester (9CI) 3734-58-5 CROTONIC ACID, 3-HYDROXY-, m-NITROBENZYL ESTER, DIMETHYL PHOSPHATE (ESTER) ENT 25,578 SD 5539 Shell SD-5539