metal-organic compounds
In the title compound, [Na(C5H5N4O3)]·2H2O, each Na cation is linked to three C5H4N4O3− anions and two water molecules, forming approximately octahedral NaNO5 units; the cations and the anions form molecular ladders, and each ladder is linked to four neighbouring ladders by O—HO and O—HN hydrogen bonds.