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The title compound, C18H14N2O2, is a new oxoisoaporphine derivative synthesized by alkyl­ation of 6-chloro-1-aza­benzanthrone. The oxoisoaporphine fragment deviates significantly from planarity with a dihedral angle of 5.1 (1)° between the heterocycle and the remote benzene ring. The amino and oxo groups are involved in an intra­molecular N—H...O hydrogen bond, while the hy­droxy groups form inter­molecular O—H...N hydrogen bonds, which link pairs of mol­ecules into inversion dimers. In the dimer, two approximately parallel oxoisoaporphine fragments exhibit π–π inter­actions between the aromatic rings, the shortest centroid–centroid distance being 3.649 (3) Å.
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