A new xanthone glycoside, 1,8-dihydroxyl-2,5-dimethoxy-xanthone-6-O--D-glucoside (), along with two known xanthone glycosides and two flavonoid glycosides were isolated from the aerial parts of (L.) Fries es Nym. The structure of was elucidated by analysis of its spectroscopic data, including UV, IR, HR-ESI-MS and extensive 1 D and 2 D NMR techniques. In vitro test, compound behaved similarity to swertianolin against α‑glucosidase and more potent inhibitory effects than the positive control, acarbose.
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