title: [Studies on phenanthrene constituents from stems of Dendrobium candidum].
abstract: OBJECTIVE
  To investigate chemical constituents from the stems of Dendrobium candidum.
  
  
  METHODS
  The constituents were isolated by various column chromatography methods, and their structures were elucidated by spectral analysis (IR, UV, NMR and MS).
  
  
  RESULTS
  Six compounds were isolated from ethanol extract and their structures were identified as 2,3,4,7-tetramethoxyphenanthrene (I), nakaharain (II), 2,5-dihydroxy-3,4-dimethoxyphenanthrene (III), confusarin (IV), nudol (V) and bulbophyllanthrin (VI).
  
  
  CONCLUSIONS
  Among these compounds, compounds II, III, VI are isolated from Dendrobium candidum for the first time.
authors.affiliation: Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.
authors.forename: Rong-sheng
authors.initials: RS
authors.lastname: Li
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.forename: Ping
authors.initials: P
authors.lastname: He
authors.forename: Ning
authors.initials: N
authors.lastname: Gan
mesh_terms: D002855:Chromatography, Thin Layer; D031667:Dendrobium / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D015394:Molecular Structure; D010616:Phenanthrenes / Q000737:chemistry / Q000302:isolation & purification*; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D010616:Phenanthrenes