title: 14-Bromo-12-chloro-2,16-dioxa-penta-cyclo-[7.7.5.0(1,21).0(3,8).0(10,15)]henicosa-3(8),10,12,14-tetra-ene-7,20-dione.
abstract: In the title compound, C19H16BrClO4, both the fused xanthene rings and one of the cyclo-hexane rings adopt envelope conformations, while the other cyclo-hexane ring is in a chair conformation. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds, forming infinite chains running along [10-1] incorporating R 2 (2)(16) ring motifs. In addition, C-H⋯π inter-actions and weak π-π stacking inter-actions [centroid-centroid distance = 3.768 (3) Å] help to consolidate the packing.
authors.affiliation: Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland.
authors.forename: Alan R
authors.initials: AR
authors.lastname: Kennedy
authors.forename: Mehmet
authors.initials: M
authors.lastname: Akkurt
authors.forename: Shaaban K
authors.initials: SK
authors.lastname: Mohamed
authors.forename: Antar A
authors.initials: AA
authors.lastname: Abdelhamid
authors.forename: Adel A E
authors.initials: AA
authors.lastname: Marzouk