68958-86-1 EINECS 273-375-3 Nickelate(6-), (((1,2-ethanediylbis((nitrilo-kappaN)bis(methylene)))tetrakis(phosphonato-kappaO))(8-))-, pentaammonium hydrogen, (OC-6-21)- Pentaammonium hydrogen (((ethylenebis(nitrilobis(methylene)))tetrakis(phosphonato))(8-))nickelate(6-) Pentaammonium nickelous 1,2-ethanedi(nitrilodi(methylene phosphonate))