Methyl 4′-(4-fluoro­phen­yl)-1′-methyl-3′-nitro­methyl-2-oxospiro­[indoline-3,2′-pyrrolidine]-3′-carboxyl­ate

In the title compound, C₂₁H₂₀FN₃O₅, the the pyrrolidine ring makes dihedral angles of 84.91 (6) and 62.38 (7)° with the oxindole unit and the fluoro­phenyl ring, respectively. The pyrrolidine ring assumes an envelope conformation with the spiro C atom as the flap. The crystal packing features weak N—H...N and C—H...O hydrogen bonds.