organic compounds
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In the title compound, C10H11N3O2, the nitro group is essentially coplanar with the aromatic ring [dihedral angle = 3.4 (3)°] and forms an intramolecular N—HO hydrogen bond with the amine group. In the crystal, weak aromatic C—HO and C—HN hydrogen bonds link the molecules. Weak aromatic ring π–π interactions [minimum ring centroid–centroid separation = 3.9841 (16) Å] are also present.