title: [Studies on chemical constituents from bark of Biebersteinia heterostemon].
abstract: OBJECTIVE
  To study the chemical constituents of the whote plant Biebersteinia heterostemon (Geraniaceae).
  
  
  METHODS
  The ethanol extract of the whole plants was separated by various chromatographic methods and the compounds from the extract were identified by spectroscopic evidence including MS, IR, NMR and X-ray crystallographic analysis.
  
  
  RESULTS
  Three isoprenyl guanidine derivatives were isolated from the whole plant of Biebersteinia heterostemon and identified as galegine (1) , cis-4-hydroxygalegine (2) and trans-4-hydroxygalegine (3).
  
  
  CONCLUSIONS
  The three compounds were isolated from this plant for the first time.
authors.affiliation: The Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining 810007, China.
authors.forename: Hai-Feng
authors.initials: HF
authors.lastname: Wu
authors.forename: Xiao-Feng
authors.initials: XF
authors.lastname: Zhang
authors.forename: Ye
authors.initials: Y
authors.lastname: Deng
authors.forename: Li
authors.initials: L
authors.lastname: Pan
authors.forename: Li-Sheng
authors.initials: LS
authors.lastname: Ding
mesh_terms: D031314:Geraniaceae / Q000737:chemistry*; D006146:Guanidines / Q000737:chemistry / Q000302:isolation & purification*; D008968:Molecular Conformation; D015394:Molecular Structure; D024301:Plant Bark / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D006146:Guanidines; C074315:galegine