title: [Studies on the chemical comstituents of Pithecellobium clypearia].
abstract: OBJECTIVE
  To study the chemical constituents of Pithecellobium clypearia.
  
  
  METHODS
  The compounds were isolated from Pithecellobium clypearia with column chromatography. Their structures were characterized on the basis of their physical and chemical preperties, as well as chromatographic and spectroscopic evidences.
  
  
  RESULTS
  A pair of isomeric flavans consisting of 7, 3'-O-di-gallyoltricetiflavan (I) and 7,4'-O-di-gallyoltricetiflavan (II), along with a catechin compound (-)-epigallocatechin-7-O-gallate (III) were isolated from the leaves and twigs of Pithecellobium clypearia.
  
  
  CONCLUSIONS
  Compound I is a new flavan. Compound III is isolated from Pithecellobium genus for the first time, and its 13C-NMR data is firstly given in the present study.
authors.affiliation: The Chinese University of Hong Kong, N. T., Hong Kong, China.
authors.forename: Miao-Xian
authors.initials: MX
authors.lastname: Su
authors.forename: Zhi-Yue
authors.initials: ZY
authors.lastname: Tang
authors.forename: Wei-Huan
authors.initials: WH
authors.lastname: Huang
authors.forename: Yao-Lan
authors.initials: YL
authors.lastname: Li
authors.forename: Ying-Zhou
authors.initials: YZ
authors.lastname: Cen
mesh_terms: D000998:Antiviral Agents / Q000737:chemistry / Q000302:isolation & purification; D002392:Catechin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D002851:Chromatography, High Pressure Liquid; D007887:Fabaceae / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D000998:Antiviral Agents; D005419:Flavonoids; D002392:Catechin; C045651:epigallocatechin gallate