67924-21-4 EINECS 267-806-4 Hexaammonium dihydrogen (hexane-1,6-diylbis(nitrilobis(methylene)))tetrakisphosphonate Phosphonic acid, (1,6-hexanediylbis(nitrilobis(methylene)))tetrakis-, hexaammonium salt Phosphonic acid, (hexamethylenebis(nitrilodimethylene))tetra-, hexaammonium salt