67989-89-3 Cuprate(6-), (((1,2-ethanediylbis((nitrilo-kappaN)bis(methylene)))tetrakis(phosphonato-kappaO))(8-))-, pentapotassium hydrogen, (OC-6-21)- EINECS 268-019-9 Pentapotassium cupric ethylenedi(nitrilodi(methylenephosphonate)) Pentapotassium hydrogen (((ethylenebis(nitrilobis(methylene)))tetrakis(phosphonato))(8-))cuprate(6-)