(Cyanomethyl)diethoxyphosphine oxide (Diethylphosphono)acetonitrile 2-(Diethylphosphonyl)acetonitrile 2537-48-6 Cyanomethanephosphonic acid, diethyl ester Diethyl (cyanomethyl)phosphonate Diethyl cyanomethanephosphonate NSC407826 Phosphonic acid, (cyanomethyl)-, diethyl ester