title: 14-Methoxy-2,16-dioxapentacyclo[7.7.5.0.0.0]henicosa-3(8),10,12,14-tetraene-7,20-dione.
abstract: The title compound, C(20)H(20)O(5), was synthesized from the reaction between 3-methoxysalicaldehyde and 1,3-cyclo-hexa-nedione in the presence of palladium(II) chloride. The two fused xanthene rings and one of the six-membered cyclo-hexane rings adopt envelope conformations, while the other six-membered cyclo-hexane ring is in a chair conformation. The mol-ecular packing is stabilized by weak inter-molecular C-H⋯O inter-actions.
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006,  People's Republic of China.
authors.forename: Weicheng
authors.initials: W
authors.lastname: Lu
authors.forename: Chaomei
authors.initials: C
authors.lastname: Lian
authors.forename: Yan
authors.initials: Y
authors.lastname: Yang
authors.forename: Yulin
authors.initials: Y
authors.lastname: Zhu
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677
references.citation: Stain Technol. 1981 Mar;56(2):83-5
references.pmid: 6166100