Acta Cryst. (2005). E61, o2755-o2757 [ doi:10.1107/S1600536805023494 ]
Abstract: In the title compound, C4H6N3O+·C2HO4-·H2O, the cytosine molecule is protonated and oxalic acid is in the monoionized state. The structure is stabilized by O-HO and N-HO hydrogen bonds, and van der Waals interactions. The water molecules are also found to mediate interactions between oxalate anions and cytosinium cations.
Online 30 July 2005
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