title: 4'-Methyl-14',19'-dioxa-4'-aza-spiro-[acenaphthyl-ene-1,5'-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'(1H)-dione.
abstract: In the title compound, C33H29NO4, the acenaphthyl-ene ring system is essentially planar (r.m.s. deviation = 0.0290 Å). The pyrrolidine ring adopts a C-envelope conformation with a C atom displaced by 0.671 (2) Å from the mean-plane formed by the remaining ring atoms. The pyrrolidine ring is fused to acenaphthyl-ene ring system making a dihedral angle of 88.0 (7)°. In the crystal, mol-ecules are linked into R(2)2(9) dimers via C-H⋯N and C-H⋯O hydrogen bonds. Two C atoms act as donors to the same O atom acceptor, resulting in the formation of R(2)1(7) ring motifs. These two motifs combine to form hydrogen-bonded sheets running along the a- and b-axis directions.
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