organic compounds
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In the cation of the title salt, C6H7N2O2+·C7H7O3S−, the benzene ring makes a dihedral angle of 10.2 (2)° with the nitro group. In the crystal, the cations and anions are linked by weak N—HO hydrogen bonds, forming a layer parallel to the ac plane. A weak C—HO interaction and π–π interactions [centroid–centroid distances of 3.738 (3) and 3.748 (3) Å] also observed within the layer.