title: [Flavonoids from rhizome of Alpinia tonkinensis].
abstract: OBJECTIVE
  To find out the bioactive principles of Alpinia tonkinensis, by investigating its chemical constituents.
  
  
  METHODS
  It was extracted with MeOH, distributed by different solvents, and isolated via column chromatography on silica gel.
  
  
  RESULTS
  Six compounds were elucidated through spectral analysis, which were as follows: 4',7-dimethylkaempferol(I), 5-hydroxy-3',4',7-trimethoxyflavanone(II), kumatakenin(III), 4',5,7-trimethoxyflavonol(IV), ombuine(V), and kaempferol(VI).
  
  
  CONCLUSIONS
  Six flavonoids were isolated from this plant for the first time, and so were four compounds from genus Alpinia.
authors.affiliation: Department of Natural Medicinal Chemistry, China Pharmaceutical University, Jiangsu, Nanjing 210038.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Qing-hai
authors.initials: QH
authors.lastname: Guo
authors.forename: Ling-yi
authors.initials: LY
authors.lastname: Kong
mesh_terms: D032429:Alpinia / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D044949:Kaempferols / Q000737:chemistry / Q000302:isolation & purification; D010946:Plants, Medicinal / Q000737:chemistry*; D027343:Rhizome / Q000737:chemistry
chemical_list: C487686:4',7-dimethylkaempferol; D005419:Flavonoids; D044949:Kaempferols; C487687:ombuine