Dihydrogen [[n,N'-ethylenebis[N-(carboxymethyl)glycinato]](4-)-N,N',O,O',on,on']nickelate(2-)

Dihydrogen[(ethylenedinitrilo)tetraacetato]nickelate (6CI) ; Hydrogen[(ethylenedinitrilo)tetraacetato]nickelate(II) (7CI) ; Nickelate(2-),[(ethylenedinitrilo)tetraacetato]-, dihydrogen (8CI) ; Nickelate(2-),[[N,N'-1,2-ethanediylbis[N-(carboxymethyl)glycinato]](4-)-N,N',O,O',ON,ON']-,dihydrogen, (OC-6-21)- ; Nickelate(2-), [[N,N'-1,2-ethanediylbis[N-[(carboxy-kO)methyl]glycinato-kN,kO]](4-)]-, dihydrogen, (OC-6-21)- (9CI) ; Dihydrogen[ethylenediaminetetraacetato(4-)]nickelate(2-) ; Nickelate(2-),[[N,N'-1,2-ethanediylbis[N-[(carboxy-kO)methyl]glycinato-kN,kO]](4-)]-, hydrogen (1:2), (OC-6-21)-