110905-37-8

4-(diethylphosphono)-2-butenal (E)-diethyl 4-oxobut-2-enylphosphonate (2E)-4-oxo-2-butenyl]-Phosphonic acid diethyl ester Phosphonic acid, (4-oxo-2-butenyl)-, diethyl ester, (E)- Phosphonic acid, [(2E)-4-oxo-2-butenyl]-, diethyl ester (9CI)