四乙基焦亚磷酸盐

ethyl 4-diethoxyphosphoryl-3-oxobutanoate

O，O’－二乙基－（2－琥珀酸二乙酯基）膦酸酯

diethyl 4-oxopent-2-en-2-yl phosphite

diethoxyphosphorylmethyl(diethoxy)phosphane