title: A diastereomer of methyl (1R,3'S)-1',1''-dimethyl-2,2''-dioxo-2H-dispiro-[ace-naphthyl-ene-1,2'-pyrrolidine-3',3''-indoline]-4'-carboxyl-ate.
abstract: In the title compound, C26H22N2O4, the central pyrrolidine ring adopts a twist conformation and the cyclo-pentane ring of the dihydro-acenapthylene group adopts an envelope conformation with the spiro C atom as the flap. The naphthalene ring system of the dihydro-acenaphthyl-ene group forms dihedral angles of 83.4 (9) and 61.3 (7)°, respectively, with the mean planes of the pyrrolidine and indole rings. The crystal packing is stabilized by inter-molecular C-H⋯O hydrogen bonds. The title compound is a diastereomer of a previously reported structure.
authors.affiliation: Department of Physics, S.M.K. Fomra Institute of Technology, Thaiyur, Chennai 603 103, India.
authors.forename: Gnanavelu
authors.initials: G
authors.lastname: Ganesh
authors.forename: Panneerselvam
authors.initials: P
authors.lastname: Yuvaraj
authors.forename: Piskala Subburaman
authors.initials: PS
authors.lastname: Kannan
authors.forename: Boreddy Siva Rami
authors.initials: BS
authors.lastname: Reddy
authors.forename: Arunachalathevar
authors.initials: A
authors.lastname: Subbiahpandi