Synonyms: Phosphonic acid, P,P'-(iminobis(2,1-ethanediyliminomethylene))bis-, N,N-bis(phosphonomethyl) deriv., sodium salt (1:?);Diethylenetriamine tetra(methylene phosphonic acid), sodium salt;Diethylenetriamine tetra(methylene phosphonic acids) sodium salts;(Iminobis(ethyleneiminomethylene))bis(phosphonic) acid, N,N-bis(phosphonomethyl) derivative, sodium salt;Phosphonic acid, (iminobis(2,1-ethanediyliminomethylene))bis-, N,N-bis(phosphonomethyl) deriv., sodium salt