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In the title compound, C 8 H 3 F 4 NO 3 , the carb­oxy group lies nearly in the plane of the ring with a C—C—C—O torsion angle of −10.5 (4)°. The carbamoyl group is almost perpendic­ular to the benzene ring [C—C—C—O torsion angle = 82.2 (4) °]. In the crystal, molecules are linked  via  O—H⋯O and N—H⋯O hydrogen bonds involving the carbamoyl and carb­oxy groups.

2-Carbamoyl-3,4,5,6-tetrafluorobenzoic acid