2,3,4,6-Tetra­phenyl-2H-pyrazolo­[3,4-d]­pyridazin-7(6H)-one

The title compound, C₂₉H₂₀N₄O, is a derivative of 2H-pyrazolo­[3,4-d]­pyridazine and is non-planar, although consisting of planar fragments. The structure consists of planar fragments. There are two independent mol­ecules in the asymmetric unit. The dihedral angle between the fused pyridazine and pyrazole rings is 2.61 (11)° in mol­ecule A [3.19 (11)° in mol­ecule B]. The crystal structure is stabilized by intramolecular and intermolecular C—H⋯O interactions.