title: 4,4'-Dichloro-2,2'-[(3aR,7aR/3aS,7aS)-2,3,3a,4,5,6,7,7a-octa-hydro-1H-1,3-benzimidazole-1,3-di-yl)bis-(methyl-ene)]diphenol.
abstract: Mol-ecules of the the title compound, C(21)H(24)Cl(2)N(2)O(2), are located on a twofold rotation axis, which passes through the C atom linking the two N atoms. Two intra-molecular O-H⋯N hydrogen bonds were observed. In the crystal, non-classical inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into chains along the a axis. The crystal studied was a racemic twin.
authors.forename: Augusto
authors.initials: A
authors.lastname: Rivera
authors.forename: Diego
authors.initials: D
authors.lastname: Quiroga
authors.forename: Jaime
authors.initials: J
authors.lastname: Ríos-Motta
authors.forename: Michal
authors.initials: M
authors.lastname: Dušek
authors.forename: Karla
authors.initials: K
authors.lastname: Fejfarová