1660-94-2 4-01-00-03071 (Beilstein Handbook Reference) BRN 1813241 EINECS 216-764-5 Methylenebis(diethoxyphosphine oxide) Methylenebis(diethylphosphonate) Methylenebisphosphonic acid, tetraethyl ester Methylenedi(phosphonic acid) tetraethyl ester NSC 133889 PHOSPHONIC ACID, METHYLENEDI-, TETRAETHYL ESTER Phosphonic acid, methylenebis-, tetraethyl ester Tetraethyl diphosphonomethane Tetraethyl methanediphosphonate Tetraethyl methylenebisphosphonate Tetraethyl methylenediphosphonate