(4aR*,8aS*)-2,3-Diphenyl-4a,5,6,7,8,8a-hexa­hydro­quinoxaline

In the title compound, C₂₀H₂₀N₂, the quinoxaline ring adopts a very distorted half-chair conformation [N=C-C=N = 22.7 (2)° for the nominally coplanar atoms] and the cyclo­hexane ring adopts a chair conformation. The quinoxaline and cyclo­hexane rings are cis-fused. The two phenyl rings form a dihedral angle of 63.88 (7)°.