P,P',P'',P'''-[1,2-乙烷二基二[[(膦酰甲基)亚氨基]-2,1-乙二基次氮基二(亚甲基)]]四-膦酸

N,N-bis(2-hydroxyethyl)aminomethylphosphonic acid

2-(2-hydroxy-2-oxo-1,4,2λ⁵-oxazaphosphinan-4-yl)ethanol

2-[butyl(carboxymethyl)amino]acetic acid

1-N,4-N-bis(hydroxymethyl)benzene-1,4-dicarboxamide