title: 2-Carbamoyl-3,4,5,6-tetra-fluoro-benzoic acid.
abstract: In the title compound, C(8)H(3)F(4)NO(3), the carb-oxy 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 perpendic-ular 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 carb-oxy groups.
authors.affiliation: Department of Chemistry, Jinan University, Guangzhou 510632,  People's Republic of China.
authors.forename: Tao
authors.initials: T
authors.lastname: Lu
authors.forename: Xiao-Jian
authors.initials: XJ
authors.lastname: Liao
authors.forename: Yuan-Wei
authors.initials: YW
authors.lastname: Liang
authors.forename: Shi-Hai
authors.initials: SH
authors.lastname: Xu