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In the title compound, C 20 H 13 NO, the indene ring is disordered over two sites with an occupancy ratio of 0.557 (2):0.443 (2). Both disordered components of indene are nearly perpendicular to the naphthalene ring system, making dihedral angles of 90.9 (2) and 85.0 (5)°. The five-membered ring of the 1 H -pyrrol-2(3 H )-one adopts an envelope conformation with the spiro C atom at the flap position. Inter­molecular classical N—H⋯O and weak C—H⋯O hydrogen bonding is present in the crystal structure.

Spiro[indene-1,1′-benzo[e]indolin]-2′-one