title: Xanthone O-glycosides from Polygala tenuifolia.
abstract: Four xanthone O-glycosides, polygalaxanthones IV-VII were isolated from the roots of Polygala tenuifolia Willd., together with eight known compounds. The structures of the four xanthone O-glycosides were established as 6-O-[alpha-L-rhamnopyranosyl-(1-->2)-beta-D-glucopyranosyl]-1-hydroxy-3,7-dimethoxyxanthone (polygalaxanthone IV), 6-O-[alpha-L-rhamnopyranosyl-(1-->2)-beta-D-glucopyranosyl]-1,3-dihydroxy-7-methoxyxanthone (polygalaxanthone V), 6-O-(beta-D-glucopyranosyl)-1,2,3,7-tetramethoxyxanthone (polygalaxanthone VI), and 3-O-[alpha-D-rhamnopyranosyl-(1-->2)-beta-D-glucopyranosyl]-1,6-dihydroxy-2,7-dimethoxyxanthone (polygalaxanthone VII), respectively, on the basis of analysis of spectroscopic evidence.
authors.affiliation: Modern Research Center of TCM, School of Pharmaceutical Sciences, Peking University Health Science Center, No. 38, Xueyuan Road, Haidian District, Beijing 100083, People's Republic of China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Jiang
authors.forename: Peng-Fei
authors.initials: PF
authors.lastname: Tu
mesh_terms: D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D018517:Plant Roots / Q000737:chemistry; D029608:Polygalaceae / Q000737:chemistry*; D013057:Spectrum Analysis; D014966:Xanthenes / Q000737:chemistry*; D044004:Xanthones
chemical_list: D006027:Glycosides; D014966:Xanthenes; D044004:Xanthones; C009689:xanthone