title: [Studies of the chemical constituents of Swertia davida Franch].
abstract: OBJECTIVE
  To study the active constituents of Swertia davidi Franch..
  
  
  METHODS
  Chromatography was used to isolate and purify the chemical components, their structures were identified by spectral analysis.
  
  
  RESULTS
  Three compounds were identified as 1,7-dihydroxy-3,8-dimethoxyxanthone (gentiacaulein) (V), 1,8-dihydroxy-3,7-dimethoxyxanthone (methylswertianin) (VI) and 1,8-dihydroxy-3,4,7-trimethoxyxanthone (VII).
  
  
  CONCLUSIONS
  Compound VII is a novel xanthone, named daviditin A, the others were isolated from Swertia davidi Franch. for the first time.
authors.affiliation: Department of Pharmacy, Xiangya Hospital, Central South University, Changsha 410008, China.
authors.forename: Gui-shan
authors.initials: GS
authors.lastname: Tan
authors.forename: Kang-ping
authors.initials: KP
authors.lastname: Xu
authors.forename: Ping-sheng
authors.initials: PS
authors.lastname: Xu
authors.forename: Gao-yun
authors.initials: GY
authors.lastname: Hu
authors.forename: Yuan-jian
authors.initials: YJ
authors.lastname: Li
mesh_terms: D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D029967:Swertia / Q000737:chemistry*; D044004:Xanthones / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C482744:1,8-dihydroxy-3,4,7-trimethoxyxanthone; D044004:Xanthones; C009689:xanthone