68958-88-3 EINECS 273-377-4 Hydrogen pentasodium (((ethylenebis(nitrilobis(methylene)))tetrakis(phosphonato))(8-))nickelate(6-) Nickelate(6-), (((1,2-ethanediylbis((nitrilo-kappaN)bis(methylene)))tetrakis(phosphonato-kappaO))(8-))-, pentasodium hydrogen, (OC-6-21)- Pentasodium nickelous 1,2-ethanedi(nitrilodi(methylene phosphonate))