title: 4'-Methyl-1H-14',19'-dioxa-4'-aza-spiro-[indole-3,5'-tetra-cyclo-[18.4.0.0(2,6).0(8,13)]tetra-cosa-ne]-1'(24'),8',10',12',20',22'-hexa-ene-2,7'(3H)-dione.
abstract: In the title compound, C29H28N2O4, the indoline ring system is essentially planar, with a maximum deviation of 0.027 (2) Å; the carbonyl O atom lies 0.102 (1) Å out of the least-squares plane of the indole ring. The pyrrolidine ring adopts a C-envelope conformation, with a C atom displaced by 0.643 (2) Å from the mean plane formed by the remaining ring atoms. The pyrrolidine ring makes a dihedral angle of 86.1 (8)° with the indoline ring system. In the crystal, N-H⋯O hydrogen bonds result in the formation of cyclic centrosymmetric dimers [R2(2)(8)]. C-H⋯π inter-actions also occur, leading to a chain along the b-axis direction. There is a rather weak π-π electron inter-action between the pyrrazole and benzene rings, with a centroid-centroid distance of 3.765 (1) Å.
authors.affiliation: Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India.
authors.forename: Sibi
authors.initials: S
authors.lastname: Narayanan
authors.forename: Thothadri
authors.initials: T
authors.lastname: Srinivasan
authors.forename: Santhanagopalan
authors.initials: S
authors.lastname: Purushothaman
authors.forename: Raghavachary
authors.initials: R
authors.lastname: Raghunathan
authors.forename: Devadasan
authors.initials: D
authors.lastname: Velmurugan