.beta.-(Diethoxyphosphinyl)propionitrile 10123-62-3 Diethyl (2-cyanoethyl)phosphonate Diethyl 2-cyanoethanephosphonate Ethanephosphonic acid, 2-cyano-, diethyl ester NSC43781 Phosphonic acid, (2-cyanoethyl)-, diethyl ester WLN: NC2PO&O2&O2