title: [Studies on chemical constituents from herbs of Viola yedoensis].
abstract: OBJECTIVE
  To study the chemical constituents of the whole plant of Viola yedoensis.
  
  
  METHODS
  The compounds were isolated by various chromatographic techniques and their structures were elucidated by their physicochemical properties and the analysis of their spectral data.
  
  
  RESULTS
  Seven compounds were isolated and identified as esculetin (1), isoscopoletin (2), 6-hydroxymethyl-3-pyridinol (3),5,5-bi (6,7-dihydroxycoumarin) (4), 6,6,7,7-tetrahydroxy-5,8-bicoumarin (5), loliolide (6), dehydrololiolide (7).
  
  
  CONCLUSIONS
  Compounds 2-7 were isolated from V. yedoensis for the first time.
authors.affiliation: Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herb Medicine Ministery of Education, Instituent of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing 100050, China.
authors.forename: Jiqiu
authors.initials: J
authors.lastname: Huang
authors.forename: Jingzhi
authors.initials: J
authors.lastname: Yang
authors.forename: Qingchun
authors.initials: Q
authors.lastname: Xue
authors.forename: Lei
authors.initials: L
authors.lastname: Yu
authors.forename: Dongming
authors.initials: D
authors.lastname: Zhang
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis / Q000302:isolation & purification; D032413:Viola / Q000737:chemistry*
chemical_list: D004365:Drugs, Chinese Herbal; D009930:Organic Chemicals