17-Hy­droxy-1,8-dimethyl-17-aza­penta­cyclo­[6.6.5.0^2,7.0^9,14.0^15,19]nona­deca-2,4,6,9(14),10,12-hexa­ene-16,18-dione

In the title compound, C₂₀H₁₇NO₃ (alternative name: N-hy­droxy-9,10-dimethyl-9,10-ethano­anthracene-11,12-dicarboximide), the rigid ethano­anthracene-dicarboximide moiety has a roof-shaped geometry, the inter­planar angle between the two terminal phenyl rings being 124.9 (6)°. In the crystal, mol­ecules are linked via O—H...O hydrogen bonds, forming chains along [010]. C—H...O and C—H...π inter­actions link adjacent chains, leading to the formation of a three-dimensional structure.