6-Methyl-2-p-tolyl-4-[3-(trifluoromethyl)phenyl]pyridazin-3(2H)-one

In the title molecule, C19H15F3N2O, the benzene rings of the tolyl and trifluoromethylphenyl groups form dihedral angles of 64.1 (2) and 38.5 (2)°, respectively, with the pyridazine ring. The CF3 group is disordered over two orientations, with site-occupancy factors of ca 0.56 and 0.44.