title: Macrolactone glycosides of three lichen acids from Acarospora gobiensis, a lichen of Central Asia.
abstract: The compounds isolated from the extract of Central Asian lichen (Acarospora gobiensis H. Magn.) comprised three new glycosides having 18-hydroxy-dihydroalloprotolichesterinic, 18-hydroxy-neodihydroprotolichesterinic and 18-hydroxy-dihydroprotolichesterinic acids as aglycones and a di- or trisaccharide moiety linked at C-18 and at the carboxylic group. These compounds, called gobienines A-C, were found to be di- or trisacharides forming a macrolactone with the aglycone. The structures were elucidated by using extensive spectroscopic analysis (1D and 2D NMR, MS, IR and ORD) and chemical and enzymatic methods.
authors.affiliation: Institute of Microbiology, Vídenská 1083, 14220 Prague, Czech Republic. rezanka@biomed.cas.cz
authors.forename: T
authors.initials: T
authors.lastname: Rezanka
authors.forename: I A
authors.initials: IA
authors.lastname: Guschina
mesh_terms: D006017:Glycolipids; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D008011:Lichens / Q000737:chemistry*; D012426:Russia
chemical_list: D006017:Glycolipids; D006027:Glycosides; C447020:gobienine A; C447019:gobienine B; C447018:gobienine C