Acta Cryst. (2013). E69, o1305 [ doi:10.1107/S1600536813019776 ]
Abstract: In the title compound, C8H9N3O4, there are two molecules in the asymmetric unit, one of which is in the zwitterionic form. The zwitterion contains an intramolecular N-HO hydrogen bond and the other molecule contains both an intramolecular N-HO and an intramolecular O-HO hydrogen bond. In the crystal, N-HO and N-HN hydrogen bonds link the molecules, formimg a two-dimensional network parallel to (10-1).
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