824-72-6 Benzenephosphonic dichloride Benzenephosphonodichloridic acid Benzenephosphonyl chloride Dichlorophenylphosphine oxide NSC66477 PHENYLPHOSPHONIC DICHLORIDE Phenyldichlorophosphine oxide Phenylphosphonic acid dichloride Phenylphosphonodichloridic acid Phenylphosphonyl dichloride Phosphonic dichloride, phenyl-