title: rac-Methyl (1R,3'S)-1',1''-dimethyl-2,2''-dioxo-2H-dispiro-[acenaphthyl-ene-1,2'-pyrrolidine-3',3''-indoline]-4'-carboxyl-ate.
abstract: In the title compound, C(26)H(22)N(2)O(4), the pyrrolidine ring adopts a twisted conformation and the other five-membered rings adopt envelope conformations with the spiro C atoms as the flap atoms. The naphthalene ring system of the dihydro-acenaphthyl-ene group forms dihedral angles of 89.2 (9) and 75.5 (6)° with the pyrrolidine and indole rings, respectively. The pyrrolidine ring makes a dihedral angle of 80.1 (9)° with the indole ring. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds, forming chains along the b-axis direction.
authors: Department of Physics, S.M.K. Fomra Institute of Technology, Thaiyur, Chennai 603 103,  India.
authors: G
authors: G
authors: Ganesh
authors: Panneer Selvam
authors: PS
authors: Yuvaraj
authors: Chinthalapuri
authors: C
authors: Divakara
authors: Boreddy S R
authors: BS
authors: Reddy
authors: A
authors: A
authors: Subbiahpandi