Abstract
In the title compound, C
20
H
18
O
2
, the fused-ring systems are essentially planar (r.m.s. deviations of the nine fitted atoms = 0.009 and 0.027 Å) and exhibit an orthogonal relationship [dihedral angle = 79.83 (5)°]. To a first approximation, the ketone-O atoms are directed to opposite sides of the molecule. A three-dimensional architecture arises in the crystal packing owing to C—H⋯O, C—H⋯π and π–π interactions [between centrosymmetrically related benzene rings with centroid–centroid distance = 3.7647 (10) Å].