title: [Chemical contituents in leaves of Ehretia thyrsiflora].
abstract: OBJECTIVE
  To investigate the chemical constituents of Ehretia thyrsiflora.
  
  
  METHODS
  Compounds were isolated with silica gel, Sephadex LH-20 and RP-C18 colum chromatography. Their structures were elucidated by means of physico-chemical properties and spectral analysis.
  
  
  RESULTS
  Six compounds were isolated and identified as beta-sitosterol (1), ethyl caffeate (2), 2-methoxyl benzoic acid octyl ester (3), tetradecenoic acid, 2,3-dihydroxypropyl ester (4), daucoster (5), allantoin (6).
  
  
  CONCLUSIONS
  Compounds 1-5 were obtained from this species for the first time. Compounds 2-5 were obtained from the genus Ehretia for the first time.
authors.affiliation: Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Science, Peking Union Medical College, Beijing 100193, China.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Renbing
authors.initials: R
authors.lastname: Shi
authors.forename: Tana
authors.initials: T
authors.lastname: Wu-Lan
authors.forename: Liji
authors.initials: L
authors.lastname: Xu
authors.forename: Yong
authors.initials: Y
authors.lastname: Peng
authors.forename: Peigen
authors.initials: P
authors.lastname: Xiao
mesh_terms: D000481:Allantoin / Q000737:chemistry; D028082:Boraginaceae / Q000737:chemistry*; D002109:Caffeic Acids / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D018515:Plant Leaves / Q000737:chemistry*; D012855:Sitosterols / Q000737:chemistry
chemical_list: D002109:Caffeic Acids; D012855:Sitosterols; D000481:Allantoin; C025473:gamma-sitosterol; C032773:ethyl caffeate