Acta Cryst. (2013). E69, o885 [ doi:10.1107/S1600536813012610 ]
Abstract: The crystal structure of the title compound, C5H4N2O2, is built of acid molecules located on a mirror plane. They form sheets stacked along the b-axis direction. The molecules interact via O-HN hydrogen bonds, forming  chains, and weak van der Waals interactions.
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