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The title compound, C21H12Cl2N2O3, is a 1,4-diaroyl pyrazole derivative and has three aromatic rings. The dihedral angles between the naphthalene ring system and the pyrazole ring, the pyrazole and phenyl rings and the naphthalene ring system and the phenyl ring are 49.44 (13), 49.87 (16) and 0.58 (11)°, respectively. The phenolic proton forms an intra-molecular O-H⋯O hydrogen bond with an adjacent carbonyl O atom. In the crystal, the mol-ecules are linked through stacking inter-actions between the pyrazole rings [centroid-centroid distances = 3.546 (3)] and between the naphthalene ring system and the phenyl ring [centroid-centroid distances = 3.609 (4) Å] along the a-axis direction. The mol-ecules are further connected through C-H⋯O hydrogen bonds, forming inversion dimers.

Crystal structure of (3,5-dichloro-2-hydroxyphenyl){1-[(naphthalen-1-yl)carbonyl]-1H-pyrazol-4-yl}methanone