3-Nitroso-2,4,6,8-tetraphenyl-3,7-diazabicyclo[3.3.1]nonan-9-one

In the title compound, C31H27N3O2, the two piperidine rings fused to each other each adopt a slightly distorted chair conformation. The phenyl rings on the N-unsubstituted piperidine ring occupy an equatorial position, while those on the N-nitroso-substituted piperidine ring are in axial positions. The NO group is approximately coplanar with the piperidine ring with a maximum deviation of 0.048 (4) angstrom. The dihedral angles between the mean planes of the axially and equatorially oriented phenyl rings are 27.7 (1)degrees and 31.9 (1)degrees, respectively. Molecular packing is stabilized by weak intermolecular C-H center dot center dot center dot O and C-H center dot center dot center dot pi interactions.