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metal-organic compounds
The Bi atom in the title compound, (CH6N3)2[Bi(C18H25N4O12)].4H2O is nine-coordinated through four N and five O atoms of the ttha ligand, where ttha denotes triethylenetetraaminehexaacetate. The non-coordinated COOH group is involved in a strong hydrogen bond with an O atom of a neighbouring complex, thereby forming dimeric units.