Polygala plants contain a large number of xanthones with good physiological activities. In our previous work, 18 xanthones were isolated from Extented study of the chemical composition of the other species led to the separation of two new xanthones-3-hydroxy-1,2,6,7,8-pentamethoxy xanthone () and 6--β-d-glucopyranosyl-1,7-dimethoxy xanthone ()-together with 14 known xanthones. Among them, some xanthones have a certain xanthine oxidase (XO) inhibitory activity.
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