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In the title compound, C20H18N4O, the dihedral angle between the pyrazole and pyrazolone rings is 69.35 (3)° and an intramolecular C—H...O hydrogen bond encloses an R22(6) ring. In the crystal, the packing features N—H...O and C—H...O hydrogen bonds and C—H...π(ring) interactions

5-Methyl-4-(3-methyl-1-phenyl-1H-pyrazol-4-yl)-2-phenyl-2,3-dihydro-1H-pyrazol-3-one