title: 5-(4-Fluoro-benzyl-idene)-4'-(4-fluoro-phen-yl)-1,1'-dimethyl-dispiro-[piperidine-3,3'-pyrrolidine-2',3''-indoline]-4,2''-dione.
abstract: The asymmetric unit of the title compound, C(30)H(27)F(2)N(3)O(2), contains two independent mol-ecules. The pyrrolidine five-membered ring assumes an envelope conformation (with the CH(2) atom at the flap) in one mol-ecule and a twisted conformation in the other one. In both independent mol-ecules, the 4-piperidinone rings adopt a similar twisted chair conformation. In the crystal, the two independent mol-ecules form an R(2) (2)(8) dimer through a pair of N-H⋯O hydrogen bonds; the R(2) (2)(8) dimers are connected via weak C-H⋯O hydrogen bonds, leading to a chain extending along the c axis.
authors.affiliation: Department of Physics, Thiagarajar College, Madurai 625 009,  India.
authors.forename: V Rajni
authors.initials: VR
authors.lastname: Swamy
authors.forename: S
authors.initials: S
authors.lastname: Ramaswamy
authors.forename: N
authors.initials: N
authors.lastname: Srinivasan
authors.forename: R Ranjith
authors.initials: RR
authors.lastname: Kumar
authors.forename: R V
authors.initials: RV
authors.lastname: Krishnakumar