Two New Xanthone Glycosides from Polygala tenuifolia

摘要

Two new xanthone glycosides, polygalaxanthone Ⅳ and Ⅴ were isolated from the roots of Polygala tenulfolia Willd. Their structures were established as 6-O-[α-L-rhamnopyranosyl-(1→2)-β-D-glucopvranosyl]-1-hydroxy-3,7-dimethoxyxanthone (polygataxanthone Ⅳ), and 6-O-[α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl]-1, 3-dihydroxy-7-methoxyxanthone (polyga-laxanthone Ⅴ), respectively, on the basis of chemical and spectral evidence.