The title compound, C 13 H 10 ClNO 2 , was synthesized by a Buchwald-Hartwig reaction and its crystal structure was investigated for the first time. Crystallization in a variety of solvents led to the discovery of one crystal form. High-quality single crystals were obtained by slow evaporation and the crystal structure was determined by single-crystal X-ray diffraction. The mol-ecules in the crystal structures are highly twisted [the dihedral angle between the aromatic rings is 34.66 (6)°] and pair up to form acid-acid dimers.