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In the title compound, C20H17NO3 (alternative name: N-hy-droxy-9,10-dimethyl-9,10-ethano-anthracene-11,12-dicarboximide), the rigid ethano-anthracene-dicarboximide moiety has a roof-shaped geometry, the inter-planar angle between the two terminal phenyl rings being 124.9 (6)°. In the crystal, mol-ecules are linked via O-H⋯O hydrogen bonds, forming chains along [010]. C-H⋯O and C-H⋯π inter-actions link adjacent chains, leading to the formation of a three-dimensional structure.

17-Hydroxy-1,8-dimethyl-17-azapentacyclo[6.6.5.02,7.09,14.015,19]nonadeca-2,4,6,9(14),10,12-hexaene-16,18-dione

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