title: Spiro-[indene-1,1'-benzo[e]indolin]-2'-one.
abstract: 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 1H-pyrrol-2(3H)-one adopts an envelope conformation with the spiro C atom at the flap position. Inter-molecular classical N-H⋯O and weak C-H⋯O hydrogen bonding is present in the crystal structure.
authors.affiliation: School of Pharmaceutical Science, Southern Medical University, Guangzhou 510515, People's Republic of China.
authors.forename: Jin-Xiang
authors.initials: JX
authors.lastname: Chen
authors.forename: Yu-Qin
authors.initials: YQ
authors.lastname: Wang
authors.forename: Shu-Wen
authors.initials: SW
authors.lastname: Liu
authors.forename: Wei-Er
authors.initials: WE
authors.lastname: Lin
authors.forename: Zhi-Peng
authors.initials: ZP
authors.lastname: Chen