title: Methyl 4'-(4-fluoro-phen-yl)-1'-methyl-3'-nitro-methyl-2-oxospiro-[indoline-3,2'-pyrrolidine]-3'-carboxyl-ate.
abstract: In the title compound, C(21)H(20)FN(3)O(5), the the pyrrolidine ring makes dihedral angles of 84.91 (6) and 62.38 (7)° with the oxindole unit and the fluoro-phenyl 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.
authors: Post Graduate and Research Department of Physics, Queen Mary's College, Chennai-4, Tamilnadu,  India.
authors: B K
authors: BK
authors: Revathi
authors: S
authors: S
authors: Sathya
authors: G
authors: G
authors: Usha
authors: G
authors: G
authors: Murugan
authors: M
authors: M
authors: Bakthadoss