title: [Studies on the chemical constituents of Uncaria yunanensis Hsia. C.C].
abstract: OBJECTIVE
  To research the chemical constituents from dried roots of Uncaria yunanensis Hsia. C. C.
  
  
  METHODS
  Modern chromatography was used to isolate chemical components. Their structure were identified by spectral analysis.
  
  
  RESULTS
  Seven compounds were isolated and identified as 3 beta, 6 beta, 19 alpha-trihydroxyurs-12-en-28 oic acid (I), 23-nor-24-esomethylene-3 beta, 6 beta-19 alpha-trihydroxyurs-12-en-28 oic acid (II), 3-oxo-6 beta, 19 alpha-dihydroxyurs-12-en-28 oic acid (III), oleanic acid (IV), 5,7,3',4'-tetrahydroxy-flavan-3-ol (V), beta-yohimbine (VI) and diangoutengjian I (VII).
  
  
  CONCLUSIONS
  All of the above compounds were isolated for the first time from the root of this plant. Among them, compound VII is a new one.
authors.affiliation: College of Pharmacy Second Military University, Shanghai 200433, China. taochaoyang@21cn.com
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Tao
authors.forename: Y H
authors.initials: YH
authors.lastname: Yi
authors.forename: Q Z
authors.initials: QZ
authors.lastname: Xu
mesh_terms: D026121:Indole Alkaloids / Q000737:chemistry / Q000302:isolation & purification*; D008968:Molecular Conformation; D015394:Molecular Structure; D009828:Oleanolic Acid / Q000737:chemistry / Q000302:isolation & purification; D010946:Plants, Medicinal / Q000737:chemistry*; D032070:Uncaria / Q000737:chemistry*; D015016:Yohimbine / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D026121:Indole Alkaloids; C475965:diangoutengjian I; D015016:Yohimbine; D009828:Oleanolic Acid