title: Prenylated xanthone glucosides from Ural's lichen Umbilicaria proboscidea.
abstract: Two new compounds isolated from an extract of a Central Asian lichen [Umbilicaria proboscidea (L.) Schrader=Syn.: Gyrophora proboscidea (L.) Ach.] are glucosides with mono- and di-prenylated xanthones as the aglycones and a saccharide moiety from two glucoses linked at C-7. The structures were elucidated on the basis of extensive spectroscopic analysis (1D and 2D NMR, MS, IR and UV) and by hydrolysis.
authors.affiliation: Institute of Microbiology, Vídenská 1083, Prague 14220, Czech Republic. rezanka@biomed.cas.cz
authors.forename: Tomás
authors.initials: T
authors.lastname: Rezanka
authors.forename: Jitka
authors.initials: J
authors.lastname: Jáchymová
authors.forename: Valery M
authors.initials: VM
authors.lastname: Dembitsky
mesh_terms: D001203:Ascomycota / Q000737:chemistry*; D004187:Disaccharides / Q000737:chemistry / Q000302:isolation & purification*; D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification*; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D012426:Russia; D014966:Xanthenes / Q000737:chemistry* / Q000302:isolation & purification*; D044004:Xanthones
chemical_list: D004187:Disaccharides; D005960:Glucosides; D014966:Xanthenes; D044004:Xanthones; C472943:umbilicaxanthoside A; C472944:umbilicaxanthoside B; C009689:xanthone