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In the title compound, C 22 H 16 N 2 O 3 , the naphthalene ring, the 1,4-dihydro­pyridine ring and the cyclo­pent-2-enone ring are nearly coplanar, with the dihedral angles between the neighbouring rings being 1.93 (11) and 2.30 (9)°, respectively. The benzene ring group at position 7 and the 1,4-dihydro­pyridine ring form a dihedral angle of 78.75 (4)°. Inter­molecular N—H⋯O hydrogen bonds and C—H⋯π inter­actions stabilize the crystal packing.

7-(3-Nitrophenyl)-9,10-dihydro-7H-benzo[h]cyclopenta[b]quinolin-8(11H)-one