(Z)-4-[(2-Amino-4,5-dichloro­anilino)(phenyl)methyl­idene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

The mol­ecule of the title compound, C₂₃H₁₈Cl₂N₄O, assumes a non-planar conformation in which the pyrazolone ring forms dihedral angles of 32.61 (19), 76.73 (14) and 52.57 (19)° with the three benzene rings. The secondary amino group is involved in an intra­molecular N—H...O hydrogen bond. In the crystal, mol­ecules are linked by pairs of N—H...O hydrogen bonds, forming inversion dimers. An offset stacking inter­action is observed between the chloro-substituted benzene rings protruding on both sides of these dimers [centroid–centroid distance = 3.862 (1) Å].