title: [Studies on chemical constituents of Dioscorea opposita].
abstract: OBJECTIVE
  To study the chemical constituents of Dioscorea opposita.
  
  
  METHODS
  The chemical constituents were isolated and purified by silica gel column chromatography, and the structures were elucidated by their spectroscopic data and physico-chemical properties.
  
  
  RESULTS
  Twelve compounds were obtained and identified as palmitic acid (1), beta-sitosterol (2), oleic acid (3), beta-sitosterol acetate (4), 5-(hydroxymethyl)furfural (5), nonanedioic acid (6), beta-daucosterol (7), cyclo-(Phe-Tyr) (8), cyclo-(Tyr-Tyr) (9), 6-methyl citrate (10), 1, 5-dimethyl citrate (11), trimethyl citrate (12).
  
  
  CONCLUSIONS
  Compounds 3-12 were isolated from this plant for the first time and cyclodipeptides were firstly isolated from the Dioscoreae family; Compound 9 was a new natural product.
authors.affiliation: Henan University, Key Lab of Natural Drug and Immune Engineering of Henan Province, College of Chemistry and Chemical Engineering, Kaifeng 475001, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Bai
authors.forename: Ming-Jing
authors.initials: MJ
authors.lastname: Li
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiu-Hua
authors.initials: XH
authors.lastname: Liu
mesh_terms: D002850:Chromatography, Gel; D027742:Dioscorea / Q000737:chemistry*; D004365:Drugs, Chinese Herbal / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry
chemical_list: D004365:Drugs, Chinese Herbal