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The asymmetric unit of the title compound, C 23 H 30 N 2 O 2 , contains one half-mol­ecule, with a twofold axis splitting the mol­ecule in two identical halves. The structure of the racemic mixture has been reported previously [Rivera  et al.  (2009  ▶ )  J. Chem. Crystallogr .  39 , 827–830] but the enanti­omer reported here crystallized in the  ortho­rhom­bic  space group  P 2 1 2 1 2 ( Z  = 2), whereas the racemate occurs in the  triclinic  space group  P -1 ( Z  = 2). The observed mol­ecular conformation is stabilized by two intra­molecular O—H⋯N hydrogen bonds, which generate rings with graph-set motif S(6). In the crystal, mol­ecules are linked  via  non-classical C—H⋯O inter­actions, which stack the mol­ecules along the  b  axis.

4,4′-Dimethyl-2,2′-{[2,3,3a,4,5,6,7,7a-octahydro-1H-benzimidazole-1,3-diyl]bis(methylene)}diphenol