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In the title compound, C9H7NO6, the dihedral angles between the benzene ring and its three substituents are 29.99 (8)° for the nitro, 67.09 (8)° for the carb­oxy and 32.48 (10)° for the meth­oxy­carbonyl group. In the crystal, one classical O—H...O and two nonclassical C—H...O contacts link adjacent mol­ecules, forming a three-dimensional structure.
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