3-Methyl-5,6-diphenyl-1H-pyrazolo­[1,2-a]cinnolin-1-one

The asymmetric unit of the title compound, C24H18N2O, comprises two crystallographically independent mol­ecules (A and B), with slightly different conformations. In each mol­ecule, there is an intra­molecular C—H⋯O hydrogen bond forming an S(6) ring motif. The pyridazine rings of the pyrazolo­[1,2-a]cinnoline units have screw-boat conformations. Their mean planes are inclined to the phenyl rings by 83.81 (8) and 74.19 (8)° in mol­ecule A, and 89.72 (8) and 71.07 (8)° in mol­ecule B. In the crystal, the A and B mol­ecules are linked by a pair of C—H⋯O hydrogen bonds, forming an A–B dimer with an R22(14) ring motif. These dimers are linked by further C—H⋯O hydrogen bonds, forming ribbons propagating along the b-axis direction. The ribbons are linked by a number of C—H⋯π inter­actions, forming a three-dimensional structure.