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

In the title compound, C₈H₃F₄NO₃, 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.