title: [Dihydroflavones in Rhododendron concinnum].
abstract: OBJECTIVE
  To study the chemical constituents of the whole plant of Rhododendron concinnum.
  
  
  METHODS
  The compounds were isolated and purified by chromatography on silica gel and polyamide. Their structures were identified on the basis of spectroscopic data (MS,1H-NMR and 13C-NMR) and chemical evidence.
  
  
  RESULTS
  Five dihydroflavones were isolated and identified as (2R)-farrerol-7-O-glucopyranoside (1), (2R,3R)-(-)-dihydroquercetin-3-O-beta-D-xylopyranoside(2), (2S,3S)-(-)-dihydroquercetin-3-O-beta-D-glucopyranoside(3), eriodictyol-7-O-beta-D-glucopyranoside (4) , (2R, 3R)-(+)-dihydroquercetin (5).
  
  
  CONCLUSIONS
  Except compound 5, others were firstly isolated from the genus Rhododendron.
authors.affiliation: Department of Pharmacy, Gansu College of Traditional Chinese Medicine, Lanzhou 730000, China. luckleizhao@126.com
authors.forename: Lei
authors.initials: L
authors.lastname: Zhao
authors.forename: Dinghui
authors.initials: D
authors.lastname: Wu
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Yu
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002867:Chromones / Q000737:chemistry; D006801:Humans; D020128:Inhibitory Concentration 50; D009682:Magnetic Resonance Spectroscopy; D011794:Quercetin / Q000031:analogs & derivatives* / Q000032:analysis / Q000494:pharmacology; D029793:Rhododendron / Q000737:chemistry*; D058428:Silica Gel; D012822:Silicon Dioxide / Q000032:analysis / Q000494:pharmacology
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D002867:Chromones; C015881:farrerol; D058428:Silica Gel; D012822:Silicon Dioxide; D011794:Quercetin; C003377:taxifolin