Methyl 5′′-chloro-1′,1′′-dimethyl-2,2′′-dioxodi­spiro­[indoline-3,2′-pyrrolidine-3′,3′′-indoline]-4′-carboxyl­ate

In the title compound, C(22)H(20)ClN(3)O(4), the central pyrrolidine ring adopts an envelope conformation on the N atom. The indolinone systems are individually roughly planar, with maximum deviations from their mean planes of 0.130 Å for the spiro C atom of the indolinone unit and 0.172 Å for the carbonyl C atom of the 5-chloro-1-methyl­indolinone unit. They make dihedral angles of 77.7 (8) and 86.1 (8)° with the mean plane through the central pyrrolidine ring. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds supported by C—H⋯O contacts into chains along the ab diagonal. The structure also features C—H⋯O hydrogen bonds, forming R (2) (2)(8) and R (2) (2)(16) rings and generating a three-dimensional array.