title: [Water-soluble chemical constituents of Swertia davidi Franch].
abstract: OBJECTIVE
  To study the active constituents of Swertia davidi Franch.
  
  
  METHODS
  Column chromatographies on silica gel, Sephadex LH-20 and Diaion-201 et al. were used to isolate and purify the chemical components. Their structures were identified by UV, IR, MS, NMR and 2D-NMR.
  
  
  RESULTS
  These compounds were elucidated as 8-O-beta-D-glucopyranosyl-1, 3, 5-trihydroxyxanthone (I), 5-O-beta-D-glucopyranosyl-1, 8-dihydroxy-3-methoxyxanthone (II), 5-O-beta-D-glucopyranosyl-1, 3, 8-trihydroxyxanthone (III) and swertamarin (IV).
  
  
  CONCLUSIONS
  Compound III is a new xanthone glucoside. The other compounds were isolated from this plant for the first time.
authors.affiliation: Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Central South University, Changsha 410078, China.
authors.forename: Guang-yao
authors.initials: GY
authors.lastname: Zeng
authors.forename: Gui-shan
authors.initials: GS
authors.lastname: Tan
authors.forename: Kang-ping
authors.initials: KP
authors.lastname: Xu
authors.forename: Xiao-ping
authors.initials: XP
authors.lastname: Xu
authors.forename: Fu-shuang
authors.initials: FS
authors.lastname: Li
authors.forename: Jian-bing
authors.initials: JB
authors.lastname: Tan
authors.forename: Gao-yun
authors.initials: GY
authors.lastname: Hu
mesh_terms: D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification*; D008968:Molecular Conformation; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D029967:Swertia / Q000737:chemistry*; D044004:Xanthones / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C493342:5-O-glucopyranosyl-1,3,8-trihydroxyxanthone; D005960:Glucosides; D044004:Xanthones; C056208:norswertianolin