93919-71-2 EINECS 300-054-8 Hexaammonium tetrahydrogen (((phosphonatomethyl)imino)bis(ethane-2,1-diylnitrilobis(methylene)))tetrakisphosphonate Phosphonic acid, (((phosphonomethyl)imino)bis(2,1-ethanediylnitrilobis(methylene)))tetrakis-, hexaammonium salt