Crystal structure of (4Z)-4-[(2E)-3-(2-chlorophenyl)-1-hydroxyprop-2-en-1-ylidene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

In the title compound, C19H15ClN2O2, the pyrazole ring is almost planar (r.m.s. deviation = 0.002 Å) and subtends dihedral angles of 5.31 (16) and 1.86 (16)° with the phenyl and chlorobenzene rings, respectively. An intramolecular O—H...O hydrogen bond closes an S(6) ring and a short C—H...O contact is also observed. In the crystal, molecules are linked by weak C—H...O interactions to generate (001) sheets. Weak aromatic π–π interactions between the chlorobenzene and pyrazole rings, with a centroid–centroid distance of 3.7956 (17) Å are also observed.