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The title compound, C7H3Cl2NO4, was prepared by the reaction of 2,4-dichloro-6-nitrotoluene with 20% HNO3 solution at 430 K. The carboxyl and nitro groups are twisted by 82.82 (12) and 11.9 (2)°, respectively, with respect to the benzene ring. The crystal structure is stabilized by O—H...O hydrogen bonding between carboxyl groups and weak C—H...O hydrogen bonding between the nitro group and the benzene ring of an adjacent molecule.