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The complete molecule of the title compound, C 31 H 42 N 2 O 6 , is generated by crystallographic twofold symmetry, with one C atom lying on the axis. The dihedral angle between the aromatic rings is 57.03 (6)°. The central heterocyclic ring adopts a half-chair conformation. The mol­ecular conformation is stabilized by two intra­molecular O—H⋯N hydrogen bonds with the N atoms of the heterocyclic ring as the acceptors. In the crystal, mol­ecules are linked into chains along the  c  axis by non-classical C—H⋯O hydrogen bonds.

acta crystallographica. section e

Di-n-butyl 4,4′-dihydroxy-3,3′-{[(3aRS,7aRS)-2,3,3a,4,5,6,7,7a-octahydro-1H-1,3-benzimidazole-1,3-diyl]bis(methylene)}dibenzoate