Synonyms: Phosphonic acid, P,P',P'',P'''-(1,2-ethanediylbis(nitrilobis(methylene)))tetrakis-, ammonium salt (1:?);(Ethylenebis(nitrilobis(methylene)))tetrakisphosphonic acid, ammonium salt;Phosphonic acid, (1,2-ethanediylbis(nitrilobis(methylene)))tetrakis-, ammonium salt;[ethane-1,2-diylbis(nitrilodimethanediyl)]tetrakis(phosphonic acid) ammoniate (1:1)