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In the title compound, C 19 H 11 NO 3 , the isoindolinone ring system is approximately planar with a maximum atomic deviation of 0.071 (1) Å and the five-membered ring of the dihydro­benzo[ g ]indol-3-one unit assumes an envelope conformation. The naphthalene ring system makes a dihedral angle of 39.47 (4)° with the mean plane of the isoindolinone system. Inter­molecular O—H⋯O and C—H⋯O hydrogen bonding helps to stabilize the crystal structure.

10-Hydroxy-2-azapentacyclo[10.8.0.02,10.04,9.015,20]icosa-1(12),4(9),5,7,13,15(20),16,18-octaene-3,11-dione

10-Hydroxy-2-azapentacyclo[10.8.0.0^2,10.0^4,9.0^15,20]icosa-1(12),4(9),5,7,13,15(20),16,18-octaene-3,11-dione