(Ethane-1,2-diylbis(nitrilobis(methylene)))tetrakisphosphonic acid (Ethylenedinitrilo)-tetramethylenephosphonic acid 1429-50-1 15142-96-8 22036-77-7 29462-95-1 34274-30-1 54579-31-6 57011-27-5 61827-49-4 66300-26-3 68188-96-5 68901-17-7 7651-99-2 85497-53-6 EINECS 215-851-5 ETHYLENEDIAMINETETRA(METHYLENEPHOSPHONIC ACID Phosphonic acid, (1,2-ethanediylbis(nitrilobis(methylene)))tetrakis-