N-2-Cyanoethyl-N-phosphonomethylglycine

N-(cyanomethyl)-N-(diethoxyphosphorylmethyl)acetamide

diethyl N-acetyl-N-(ethoxycarbonylmethyl)aminomethylphosphonate

2-[4-(carboxymethyl)-2,5-dioxopiperazin-1-yl]acetic acid

trimethyl ester of [[(carboxymethyl)amino]methyl]phosphonic acid