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

The title compound, C(29)H(38)N(2)O(6), was prepared as model for studying intra­molecular hydrogen-bonding inter­actions. Mol­ecules of the title compound are located on a crystallographic twofold rotation axis, which passes through the C atom linked to the two N atoms on the imidazolidine ring. The mol­ecular structure shows the existence of two intra­molecular O—H⋯N hydrogen-bonding inter­actions between the two N atoms of the imidazolidine moiety and the hy­droxy groups in the aromatic rings. The crystal structure shows the strain of ring fusion in the perhydro­benzimidazole moiety according to the endocyclic bond angles and the torsion angles, which evidence a puckering of the cyclo­hexane ring with respect to normal tetra­hedral bond angles in an ideal chair conformation.