3730-54-9 4-04-00-03657 (Beilstein Handbook Reference) AI3-25623 Acetoacetic acid, 2-phosphono-, triethyl ester BRN 1794571 BUTANOIC ACID, 2-((DIETHOXYPHOSPHINYL)OXY)-3-OXO-, ETHYL ESTER Butanoic acid, 2-(diethoxyphosphinyl)-3-oxo-, ethyl ester ENT 25,623 Ethyl-2-(diethoxyphosphinyl)-3-oxobutanoate SD 2580 Shell SD-2580