title: Three new xanthones from the roots of Polygala japonica Houtt.
abstract: Three new xanthones, 1,3-dihydroxy-2,5,6,7-tetramethoxyxanthone (1), 3-hydroxy-1,2,5,6,7-pentamethoxyxanthone (2), and 3,8-dihydroxy-1,2,6-trimethoxyxanthone (3), together with two known compounds were isolated from the roots of Polygala japonica Houtt. Their structures were determined on the basis of spectroscopic data.
authors.affiliation: Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
authors.forename: Qing-Chun
authors.initials: QC
authors.lastname: Xue
authors.forename: Chuang-Jun
authors.initials: CJ
authors.lastname: Li
authors.forename: Li
authors.initials: L
authors.lastname: Zuo
authors.forename: Jing-Zhi
authors.initials: JZ
authors.lastname: Yang
authors.forename: Dong-Ming
authors.initials: DM
authors.lastname: Zhang
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018517:Plant Roots / Q000737:chemistry; D031801:Polygala / Q000737:chemistry*; D044004:Xanthones / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C541317:1,3-dihydroxy-2,5,6,7-tetramethoxyxanthone; C541319:3,8-dihydroxy-1,2,6-trimethoxyxanthone; C541318:3-hydroxy-1,2,5,6,7-pentamethoxyxanthone; D004365:Drugs, Chinese Herbal; D044004:Xanthones