Synonyms: Cobaltate(2-),[(ethylenedinitrilo)tetraacetato]-, dihydrogen (8CI); Cobaltate(2-),[[N,N'-1,2-ethanediylbis[N-(carboxymethyl)glycinato]](4-)-N,N',O,O',ON,ON']-,dihydrogen, (OC-6-21)-; Hydrogen [(ethylenedinitrilo)tetraacetato]cobaltate(II)(7CI); Cobalt, [dihydrogen (ethylenedinitrilo)tetraacetato]-