title: 5-Chloro-5''-(4-chloro-benzyl-idene)-4'-(4-chloro-phen-yl)-1''-ethyl-1'-methyl-dispiro-[indoline-3,2'-pyrrolidine-3',3''-piperidine]-2,4''-dione.
abstract: Two spiro links are found in the title compound, C31H28Cl3N3O2, one connecting the piperidine and pyrrolidine rings, and the other connecting the pyrrolidine ring and indole residue. The piperidine ring adopts a half-chair conformation, in which the C atom connected to the spiro-C atom lies 0.741 (3) Å out of the plane of the remaining five atoms (r.m.s. deviation = 0.053 Å). The pyrrolidine ring has an envelope conformation with the flap atom being the methyl-ene C atom. Centrosymmetric eight-membered {⋯HNCO}2 amide dimers are the most significant feature of the crystal packing. These are connected into layers parallel to (-120) by C-H⋯O and π-π inter-actions between pyrrolidine-bound benzene rings [inter-centroid distance = 3.8348 (15) Å]. Slipped face-to-face inter-actions between the edges of pyrrolidine-bound benzene [shortest C⋯C separation = 3.484 (4) Å] connect the layers into a three-dimensional architecture.
authors.affiliation: Solid State Department, Physics Division, National Research Centre, Dokki, Giza, Egypt.
authors.forename: I S Ahmed
authors.initials: IS
authors.lastname: Farag
authors.affiliation: Pesticide Chemistry Department, National Research Centre, Dokki, Giza 12622, Egypt.
authors.forename: Adel S
authors.initials: AS
authors.lastname: Girgis
authors.affiliation: Physics Department, Faculty of Science, Helwan University, Helwan, Cairo, Egypt.
authors.forename: A A
authors.initials: AA
authors.lastname: Ramadan
authors.affiliation: Solid State Department, Physics Division, National Research Centre, Dokki, Giza, Egypt.
authors.forename: A M
authors.initials: AM
authors.lastname: Moustafa
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Edward R T
authors.initials: ER
authors.lastname: Tiekink