title: A new flavanone from Dryopteris sublaeta.
abstract: OBJECTIVE
  To study the chemical constituents of Dryopteris sublaeta Ching et Hsu.
  
  
  METHODS
  Fresh plant of Dryopteris sublaeta Ching et Hsu was extracted twice with boiling water, the extract was concentrated to small volume under reduced pressure at 50 degrees C. The concentrated material was partitioned with ether, ethyl acetate, and n-butanol. The fraction of ether extract was chromatographed over silica gel column. The compounds were identified on the basis of their physiochemical and spectral data.
  
  
  RESULTS
  Four compounds were obtained and identified as 2 (S)-5, 7, 3'-trihydroxy-6, 8-dimethyl-5'-methoxyflavanone (1), matteucinol (2), desmethoxymatteucinol (3) and 5, 7, 2'-trihydroxy-6, 8-dimethylflavanone (4).
  
  
  CONCLUSIONS
  Compound 1 is a new one, the others were isolated from Dryopteris for the first time.
authors.affiliation: Henan College of Traditional Chinese Medicine, Zhengzhou 450008, China. fwsh@hactcm.edu.cn
authors.forename: Wei-sheng
authors.initials: WS
authors.lastname: Feng
authors.forename: Xin-wei
authors.initials: XW
authors.lastname: Cao
authors.forename: Xiao-ke
authors.initials: XK
authors.lastname: Zheng
authors.forename: Hai-xue
authors.initials: HX
authors.lastname: Kuang
mesh_terms: D002867:Chromones / Q000737:chemistry / Q000302:isolation & purification; D032492:Dryopteris / Q000737:chemistry*; D044950:Flavanones / Q000737:chemistry / Q000302:isolation & purification*; D008968:Molecular Conformation; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: C514834:2(S)-5,7,3'-trihydroxy-6,8-dimethyl-5'-methoxyflavanone; D002867:Chromones; D044950:Flavanones; C049059:matteucinol