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

The title compound, C(23)H(30)N(2)O(4), is a Mannich base useful for studying the effect of an electron-donating phenol substituent on intra­molecular hydrogen bonding. In the mol­ecular structure, the cyclo­hexane ring adopts a chair conformation and the five-membered ring has a twisted envelope conformation. Each meth­oxy group is oriented in the same plane of the respective aromatic ring, showing torsion angles below 11.8 (3)° and bond angles between the meth­oxy group and the aromatic ring of 116.6 (2) and 116.6 (1)°. The structure shows inter­actions between two the N atoms of the heterocyclic ring and the hy­droxy groups by intra­molecular O—H⋯N hydrogen-bonding inter­actions. In the crystal, C—H⋯O inter­actions are observed. The crystal studied was a racemic mixture of RR and SS enanti­omers.