title: [Chemical Constituents from Syzygium samarangense Branches and Leaves].
abstract: OBJECTIVE
  To investigate the chemical constituents from the branches and leaves of Syzygium samarangense.
  
  
  METHODS
  The dried branches and leaves of Syzygium samarangense were powdered and extracted with 95% ethanol, then partitioned with petroleum ether, chloroform and ethyl acetate. The chloroform fraction was subjected to silica gel, Sephdex L-20 and preparative HPLC. The structures were identified by physicochemical properties and spectral data.
  
  
  RESULTS
  14 compounds were respectively isolated and identified as ursolic aldehyde(1), betulin(2), betulinic aldehyde(3), betulinic acid(4), lupeol(5), β-sitosterol(6), 5, 7-dihydroxy-6-methylflavanone(7), 2', 4'-dihydroxy-6'-methoxy-3'-methyldihydrochalcone (8), 2', 4'-dihydroxy-6'-methoxy-3'-methylchalcone (9), 5, 7-dihydroxy-6, 8-dimethylflavanone (10), 5, 7-dihydroxyflavanone (11), 2', 4'-dihydroxy-6'-methoxy-3', 5'-dimethyldihydrochalcone (12), 2'-hydroxy-4', 6'-dimethoxy-3'-methylchalcone(13) and p-hydroxyb6nzaldehyde(14).
  
  
  CONCLUSIONS
  Compounds 1 - 4 and 14 are isolated from this plant for the first time.
authors.forename: Yong-zhang
authors.initials: YZ
authors.lastname: Wu
authors.forename: Yu-bo
authors.initials: YB
authors.lastname: Zhang
authors.forename: Neng-hua
authors.initials: NH
authors.lastname: Chen
authors.forename: Guo-cai
authors.initials: GC
authors.lastname: Wang
authors.forename: Yao-lan
authors.initials: YL
authors.lastname: Li
mesh_terms: D053978:Pentacyclic Triterpenes; D064209:Phytochemicals / Q000737:chemistry* / Q000302:isolation & purification; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D012855:Sitosterols; D027842:Syzygium / Q000737:chemistry*; D014315:Triterpenes; D000094062:Betulinic Acid; D000094042:Lupanes
chemical_list: D053978:Pentacyclic Triterpenes; D064209:Phytochemicals; D010936:Plant Extracts; D012855:Sitosterols; D014315:Triterpenes; D000094062:Betulinic Acid; C025473:gamma-sitosterol; C002503:betulin; C010480:lupeol; D000094042:Lupanes