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organic compounds
In the title compound, C13H11N3O4, the substituted aromatic ring has a slightly deformed chair conformation and the unsubstituted ring a deformed boat conformation. The dihedral angle between the mean plane of the rings is 62.9 (1)°. The o-nitro group is twisted out of the plane of the phenyl ring. Short C—HO intermolecular contacts stabilize the three-dimensional structure.