(2,2-Dichloro-1-hydroxyethyl)phosphonic acid dimethyl ester 15501-45-8 AI3-20743 NS 2662 NSC 172810 O,O-Dimethyl 2,2-dichloro-1-hydroxyethylphosphonate Phosphonic acid, (2,2-dichloro-1-hydroxyethyl)-, dimethyl ester