(((2-((2-((Phosphonomethyl)amino)ethyl)amino)ethyl)imino)bis(methylene))diphosphonic acid, N-(phosphonomethyl) derivative 68785-01-3 Diethylenetriaminetetra(methylene phosphonic acid) EINECS 272-287-2 Phosphonic acid, (((2-((2-((phosphonomethyl)amino)ethyl)amino)ethyl)imino)bis(methylene))bis-, N-(phosphonomethyl) deriv.