title: [A new steroidal alkaloid from the bulbus of Fritillaria wabuensia].
abstract: OBJECTIVE
  To investigate the chemical constituents of the bulbs of Fritillaria wabuensia.
  
  
  METHODS
  Chromatography techniques were used to isolate the chemical constituents. EI-MS, 1HNMR, 13 CNMR and DEPT were used to determine the structures of the isolated constituents.
  
  
  RESULTS
  Three alkaloids were isolated from the bulbs of Fritillaria wabuensia, and were identified as imperialine (I), imperialine-beta-N-oxside (II), isoverticine-beta-N-oxide (III).
  
  
  CONCLUSIONS
  Isoverticine-beta-N-oxide was isolated from the bulbs of Fritillaria wabuensia for the first time. Isoverticine-beta-N-oxide is a new alkaloid.
authors.affiliation: West China School of Pharmaceutical Science, Si Chuan University, Chengdu 610041, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Chen
authors.forename: Li-hua
authors.initials: LH
authors.lastname: Zhu
authors.forename: Yun-feng
authors.initials: YF
authors.lastname: Xu
authors.forename: Ju-zheng
authors.initials: JZ
authors.lastname: Fan
mesh_terms: D002595:Cevanes / Q000737:chemistry / Q000302:isolation & purification; D003497:Cyclic N-Oxides / Q000737:chemistry / Q000302:isolation & purification*; D031410:Fritillaria / Q000737:chemistry*; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D002595:Cevanes; D003497:Cyclic N-Oxides; D014315:Triterpenes; C493341:isoverticine N-oxide; C047331:peiminine