1754-49-0 4-16-00-01069 (Beilstein Handbook Reference) BRN 2449931 Benzenephosphonic acid, diethyl ester Diethyl benzenephosphonate Diethyl phenylphosphonate NSC 5742 PHOSPHONIC ACID, PHENYL-, DIETHYL ESTER Phenylphosphonic acid diethyl ester