Prenylated xanthone glucosides from Ural's lichen Umbilicaria proboscidea |
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Authors: | Rezanka Tomás Jáchymová Jitka Dembitsky Valery M |
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Affiliation: | Institute of Microbiology, Vídenská 1083, Prague 14220, Czech Republic. rezanka@biomed.cas.cz |
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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. |
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Keywords: | Prenylated xanthones Xanthone glucosides Lichen Umbilicaria proboscidea |
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