title: Crystal structure of 6-(4-chloro-phen-yl)-6a-nitro-6,6a,6b,7,9,11a-hexa-hydro-spiro[chromeno[3',4':3,4]pyrrolo-[1,2-c]thia-zole-11,11'-indeno-[1,2-b]quinoxaline] chloro-form monosolvate.
abstract: In the title compound, C33H23ClN4O3S·CHCl3, the thia-zole ring adopts an envelope conformation with the N atom as the flap, and the pyrrolidine ring adopts a half-chair conformation. The thia-zole ring mean plane makes a dihedral angle of 59.31 (1)° with the pyrrolidine ring mean plane, 71.67 (1)° with the chromene ring and 82.59 (1)° with the chloro-benzene ring. An intra-molecular C-H⋯N hydrogen bond occurs. In the crystal, a second C-H⋯N hydrogen bond links the main and solvent mol-ecules. The solvent chloroform molecule is disordered about two positions with an occupancy ratio of 0.508 (14):0.492 (14).
authors.affiliation: Mission San Jose High School, Palm AVE, Fremont, CA 94539, USA.
authors.forename: Nithya
authors.initials: N
authors.lastname: Sivakumar
authors.affiliation: Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India.
authors.forename: Vijayan
authors.initials: V
authors.lastname: Viswanathan
authors.affiliation: Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India.
authors.forename: Jonnalagadda Naga Siva
authors.initials: JN
authors.lastname: Rao
authors.affiliation: Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India.
authors.forename: Raghavachary
authors.initials: R
authors.lastname: Raghunathan
authors.affiliation: Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India.
authors.forename: Devadasan
authors.initials: D
authors.lastname: Velmurugan
keywords: C—H⋯N hydrogen bonding; crystal structure; thia­zole