Synonyms: Lanthanate(1-),[[N,N'-1,2-ethanediylbis[N-(carboxymethyl)glycinato]](4-)-N,N',O,O',ON,ON']-,hydrogen, (OC-6-21)-; Lanthanum, [hydrogen (ethylenedinitrilo)tetraacetato]-(7CI); Hydrogen (ethylenediaminetetraacetato)lanthanate(1-); Lanthanumversenate