Diethyl 1-acetyl-4′-(4-chloro­phen­yl)-5′-(4-nitro­phen­yl)-2-oxospiro­[indoline-3,3′-pyrrolidine]-2′,2′-dicarboxyl­ate

In the title compound, C(31)H(28)ClN(3)O(8), the pyrrolidine ring exhibits an envelope conformation, with the spiro C atom located at the flap position. A spiro junction links the oxindole ring system and the pyrrolidine ring. The planar oxindole ring system is twisted with respect to the nitro­benzene and chloro­benzene rings, with dihedral angles of 62.34 (11) and 75.93 (9)°, respectively. In the crystal, a weak C—H⋯O interaction links the molecules into chains and two intramolecular C—H⋯O close contacts are seen.