Synonyms: Cadmate(6-), (((1,2-ethanediylbis((nitrilo-kappaN)bis(methylene)))tetrakis(phosphonato-kappaO))(8-))-, potassium hydrogen (1:5:1), (OC-6-21)-;Pentapotassium cadmium ethylene di(nitrilo di(methylene phosphonate));Cadmate(6-), (((1,2-ethanediylbis((nitrilo-kappaN)bis(methylene)))tetrakis(phosphonato-kappaO))(8-))-, pentapotassium hydrogen, (OC-6-21)-;Pentapotassium hydrogen (((ethylenebis(nitrilobis(methylene)))tetrakis(phosphonato))(8-))cadmate(6-)