5-Chloro-5''-(4-chloro-benzyl-idene)-4'-(4-chloro-phen-yl)-1',1''-dimethyldi-spiro-[indoline-3,2'-pyrrolidine-3',3''-piperidine]-2,4''-dione.

The racemic title compound, C30H26Cl3N3O2, comprises two spiro links, the first connecting the piperidine and pyrrolidine rings and the other connecting the indole and pyrrolidine rings. The piperidine ring adopts a half-chair conformation, while the pyrrolidine ring has an envelope conformation with the unsubstituted C atom as the flap. The dihedral angles between the two p-Cl-substituted benzene rings and the indole ring are 33.13 (14) and 54.11 (14)°. In the crystal, mol-ecules form inversion dimers through pairs of N-H⋯O hydrogen bonds [graph set R 2 (2)(8)]. Aromatic C-H⋯O hydrogen bonds extend these dimers into a ribbon structure, enclosing R (2) 2(14) ring motifs, along the a-axis direction.