(4-Nitrophenyl)methyl 2,3-dibromo-3-((dimethoxyphosphinyl)oxy)butanoate 63867-12-9 BUTYRIC ACID, 2,3-DIBROMO-3-HYDROXY-, p-NITROBENZYL ESTER, DIMETHYL PHOSPHATE Butanoic acid, 2,3-dibromo-3-((dimethoxyphosphinyl)oxy)-, (4-nitrophenyl)methyl ester ENT 25,744 SD 7393 Shell SD-7393