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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—H...O hydrogen bond and the other mol­ecule contains both an intra­molecular N—H...O and an intra­molecular O—H...O hydrogen bond. In the crystal, N—H...O and N—H...N hydrogen bonds link the mol­ecules, formimg a two-dimensional network parallel to (10-1).
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