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The title compound, C8H8N2O4, is almost planar (r.m.s. deviation = 0.037 Å) and an intra­molecular N—H...O hydrogen bond generates an S(6) ring. In the crystal, inversion dimers linked by pairs of O—H...O hydrogen bonds generate R22(8) loops. Inter­molecular N—H...O hydrogen bonds (involving the same H atom that forms the intra­molecular hydrogen bond) link the dimers into infinite sheets lying parallel to (102).
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