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In the title compound, C 29 H 27 ClN 4 O 2 , the six-membered ring of the pyridazine group is nearly planar [maximum deviation = −0.062 (2) Å] and its mean plane makes dihedral angles of 43.05 (9), 44.71 (10) and 72.57 (9)°, respectively, with the two phenyl and benzene rings. The piperazine ring has a chair conformation and its mean plane is almost perpendicular to the attached benzene ring, with a dihedral angle of 83.20 (16)°. In the crystal, mol­ecules are linked  via  two pairs of C—H⋯O inter­actions, which result in the formation of chains propagating along [10-1]. Neighbouring chains are linked  via  C—H⋯π inter­actions.

1-[4-(4-Chlorophenyl)piperazin-1-yl]-3-(6-oxo-3,4-diphenyl-1,6-dihydropyridazin-1-yl)propan-1-one