1-Ethyl-4′-(1H-indol-3-ylcarbon­yl)-1′-methyl-2,2′′-dioxodi­spiro­[indoline-3,2′-pyrrolidine-3′,3′′-indoline]-4′-carbo­nitrile dimethyl sulfoxide monosolvate

In the title compound, C31H25N5O3·C2H6OS, the three indole/indoline units are all essentially planar with maximum deviations of 0.0172 (3), 0.053 (2) and 0.07 (2) Å. The pyrrolidine ring adopts an envelope conformation with the C atoms bearing the 1-ethyl-2-oxo-indole substituent (in which the five-membered ring adopts a twisted conformation) as the flap. The dimethyl sulfoxide solvent mol-ecule is disordered over two positions, with an occupancy factor ratio of 0.871 (4):0.129 (4). The solvent components are linked to the heterocyclic mol-ecule via C-H⋯O and C-H⋯S hydrogen bonds. In the crystal, the solvent components are linked to the heterocyclic molecule via C-H⋯O and C-H⋯S inter-actions, forming R 2 (2)(10) ring motifs. The mol-ecules are further connected into a chain along the a-axis direction via N-H⋯O hydrogen bonds.