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In the crystal structure of the title compound, C 21 H 24 F 2 N 2 O 2 , there are two intra­molecular O—H⋯N hydrogen bonds involving the N atoms of the imidazolidine ring and the hy­droxy groups. The crystal studied was a  meso  compound obtained by the reaction of the aminal (2 S ,7 R ,11 S ,16 R )-1,8,10,17-tetra­aza­penta­cyclo­[8.8.1.1 8,17 .0 2,7 .0 11,16 ]cosane with 4-fluoro­phenol. The imidazolidine ring has a twisted conformation with a CH—CH—N—CH 2  torsion angle of 44.99 (14)° and, surprisingly, the lone pairs of the N atoms are disposed in a  syn  isomerism, making the title compound an exception to the typical ‘rabbit-ear effect’ in 1,2-diamines. In the crystal, molecules are linked  via  C—H⋯F hydrogen bonds, forming chains along the  c -axis direction. These chains are linked  via  another C—H⋯F hydrogen bond, forming a three-dimensional network.

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