5-[(E)-2-Fluoro-benzyl-idene]-8-(2-fluoro-phen-yl)-2-hy-droxy-10-methyl-3,10-di-aza-hexa-cyclo-[10.7.1.1.0.0.0]henicosa-1(20),12,14,16,18-pentaen-6-one.

In the title compound, C(33)H(26)F(2)N(2)O(2), the piperidone ring adopts a half-chair conformation and the pyrrolidine rings adopt half-chair and envelope conformations. The two benzene rings make dihedral angles of 29.58 (5) and 76.33 (5)° with the mean plane of the 1,2-dihydro-acenaphthyl-ene unit. An intra-molecular O-H⋯N hydrogen bond helps to stabilize the mol-ecular structure. In the crystal, inter-molecular C-H⋯F hydrogen bonds link the mol-ecules into [010] chains. Weak C-H⋯π inter-actions are also observed.