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The structure of the title racemic compound, C20H20N2, shows close similarity to that of the enantiomerically pure (4aR,8aR)-2,3-diphenyl-4a,5,6,7,8,8a-hexahydroquinoxaline [Wang & Ye (2008). Acta Cryst. E64, o359–o359]. The similarity applies to the unit-cell parameters as well as to the packing of the constituent molecules. Similar packing is conditioned by a lack of directed intermolecular interactions such as hydrogen bonds in either structure.