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The 4-carboxy­imidazole-5-carboxyl­ate(2−) dianion in the title compound, [Ni(C 5 H 2 N 2 O 4 )(C 16 H 36 N 4 )]·H 2 O,  N , O ′-chelates to the Ni II  atom, which shows an octa­hedral coordination. The macrocycle folds itself around the metal atom and binds to it through four secondary nitrogen atoms; adjacent molecules are linked by N—H⋯O hydrogen bonds into a linear chain. The water molecule is disordered over two positions.

acta crystallographica. section e

[4-Carboxyimidazole-5-carboxylato(2–)-κ2N1,O5](5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane-κ4N,N′,N′′,N′′′)nickel(II) monohydrate