3′-[(1H-Indol-3-yl)carbon­yl]-1′-methyl-2-oxo-4′-(thio­phen-2-yl)­spiro­[indoline-3,2′-pyrrolidine]-3′-carbo­nitrile

In the title compound, C₂₆H₂₀N₄O₂S, the central pyrrolidine ring adopts a twist conformation on the C—C bond involving the spiro C atom. Its mean plane makes dihedral angles of 78.83 (14), 65.91 (15) and 44.49 (18)° with the mean planes of the adjacent oxindole ring system, the indole system and the thio­phene ring, respectively. The indole and indoline units are essentially planar, with maximum deviations of 0.019 (3) and 0.090 (3) Å, respectively. In the oxindole fused-ring system, the pyrrole ring adopts an envelope conformation with the spiro C atom as the flap. In the crystal, pairs of N—H...O hydrogen bonds link the mol­ecules, forming inversion dimers with an R²₂(8) ring motif. The dimers are linked by further N—H...O hydrogen bonds, forming a two-dimensional network lying parallel to (100).