Acta Cryst. (2008). E64, o2316 [ doi:10.1107/S1600536808036209 ]
Abstract: The asymmetric unit of the title compound, C4H8N2O4, contains one half-molecule which is completed via a crystallographic inversion centre. In the crystal structure, molecules are arranged in undulating layers parallel to (001). Intermolecular N-HO and O-HO hydrogen bonds consolidate this arrangement.
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