title: Methyl (3R*,3'S*)-1',1''-dimethyl-2,2''-dioxodispiro-[indoline-3,2'-pyrrolidine-3',3''-indoline]-4'-carboxyl-ate.
abstract: In the title compound, C(22)H(21)N(3)O(4), the central pyrrolidine ring adopts an envelope conformation with the N atom in the flap position. The indoline ring systems are almost perpendic-ular to the mean plane of the pyrrolidine ring, making dihedral angles of 86.4 (8) and 83.1 (8)°. The acetate group attached to the pyrrolidine ring assumes an extended conformation. In thecrystal, N-H⋯O hydrogen bonds result in the formation of a C(7) chain running along [100]. The crystal packing also features π-π inter-actions [centroid-centroid distance = 3.2032 (11) Å].
authors.affiliation: Department of Physics, S.M.K. Fomra Institute of Technology, Thaiyur, Chennai 603 103,  India.
authors.forename: G
authors.initials: G
authors.lastname: Ganesh
authors.forename: Panneer Selvam
authors.initials: PS
authors.lastname: Yuvaraj
authors.forename: E
authors.initials: E
authors.lastname: Govindan
authors.forename: Boreddy S R
authors.initials: BS
authors.lastname: Reddy
authors.forename: A
authors.initials: A
authors.lastname: Subbiahpandi