title: Ketazolam.
abstract: The title compound, 11-chloro-8,12b-dihydro-2,8-dimethyl-12b-phenyl-4H-[1,3]oxazino[3,2-d][1,4]benzodiazepine-4,7(6H)-dione, C20H17ClN2O3, is a benzodiazepine with an additional d-face-fused heterocyclic ring. In the molecule, a dihedral angle of 86.2 (1) degrees is formed by the planes of the phenyl and benzo rings and the former is axially oriented from the core, i.e. the fused 6,7,6-tricyclic system. Both heterocycles in the core suffer significant deviations from planarity. The central diazepine ring is a twist-boat and the oxazine ring exhibits a conformation intermediate between half-chair and sofa.
authors.affiliation: Departamento de Física, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina. vega@cnea.gov.ar
authors.forename: D
authors.initials: D
authors.lastname: Vega
authors.forename: D
authors.initials: D
authors.lastname: Fernández
authors.forename: G
authors.initials: G
authors.lastname: Echeverría
mesh_terms: D014151:Anti-Anxiety Agents / Q000737:chemistry*; D001569:Benzodiazepines; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D008968:Molecular Conformation
chemical_list: D014151:Anti-Anxiety Agents; D001569:Benzodiazepines; C002072:ketazolam