1429-50-1 68188-96-5 EINECS 269-170-3 Ethylene bis(nitrilodimethylene)tetraphosphonic acid, tetrapotassium salt Phosphonic acid, (1,2-ethanediylbis(nitrilobis(methylene)))tetrakis-, tetrapotassium salt Tetrapotassium tetrahydrogen (ethane-1,2-diylbis(nitrilobis(methylene)))tetrakisphosphonate