title: [Studies on the chemical constituents in herb of Hedyotis diffusa].
abstract: OBJECTIVE
  To study the chemical constituents of Hedyotis diffusa.
  
  
  METHODS
  Column chromatographic techniques were used for isolation and purification of chemical constituents of this plant and their structures were identified by spectroscopic analysis.
  
  
  RESULTS
  Five compounds were isolated and identified as scandoside methyl ester (I), deacetylasperulosidic acid methyl ester (II), 10-dehydrogeniposide (III), 2-hydroxy-3-methylanthraquinone (IV), stigmasterol (V), respectively.
  
  
  CONCLUSIONS
  Compound II as iridoids was isolated from Hedyotis diffusa for the first time, compound III as iridoids was isolated from genus Hedyotis for the first time.
authors.affiliation: Key Laboratory of Research of TCM and New Drug, Southern Medical University, Guangzhou 510515, China. cpuzyy@sohu.com
authors.forename: Yong-Yong
authors.initials: YY
authors.lastname: Zhang
authors.forename: Jia-Bo
authors.initials: JB
authors.lastname: Luo
mesh_terms: D000880:Anthraquinones / Q000737:chemistry / Q000302:isolation & purification*; D003373:Coumaric Acids / Q000737:chemistry / Q000302:isolation & purification*; D032064:Hedyotis / Q000737:chemistry*; D039823:Iridoids / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D013265:Stigmasterol / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D000880:Anthraquinones; D003373:Coumaric Acids; C509054:E-6-O-p-coumaroyl scandoside methyl ester; D039823:Iridoids; D013265:Stigmasterol