Two new cycloartane saponins were isolated from the aerial parts of Astragalus sieberi. The structures were elucidated by 1D- and 2D- gradient-enhanced NMR analyses and enzymatic hydrolysis as 20(S),24(R)-epoxy-9 beta, 19-cyclolanostan-3 beta,6 alpha,16 beta,25-tetrol-3-O-beta-D-glucopyranoside and 20(S),24(R)-epoxy-9 beta,19-cyclolanostan-3 beta,6 alpha,16 beta,25-tetrol-3-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranoside.

structural elucidation, Leguminosae, Astragalus sieberi, 1D- and 2D-gradient enhanced NMR techniques, 20(S), 24(R)-epoxy-9 beta, 19-cyclolanostan-3 beta, 6 alpha, 16 beta, 25-tetrol glycosides, sieberoside I and II

• Compound ID: 28942
  

  b-D-Glcp-(1-3)-Subst Subst = cyclogalagenin = SMILES C{25}[C@](C)(O)C6CC[C@@](C)(C4{16}[C@@H](O)C[C@@]5(C)C2C{6}[C@H](O)C1[C@@](C)(C){3}[C@@H](O)CC[C@@]13C[C@@]23CC[C@]45C)O6

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  Structure type: monomer ; 651 [M-H]-
  C36H60O10
  Trivial name: sieberoside I
  Compound class: triterpenoid glycoside
  
   
  
  Astragalus sieberi
  CSDB ID 61552 (all data & tools)
• Compound ID: 28943
  

  b-D-Glcp-(1-2)-b-D-Glcp-(1-3)-Subst Subst = cyclogalagenin = SMILES C{25}[C@](C)(O)C6CC[C@@](C)(C4{16}[C@@H](O)C[C@@]5(C)C2C{6}[C@H](O)C1[C@@](C)(C){3}[C@@H](O)CC[C@@]13C[C@@]23CC[C@]45C)O6

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  Structure type: oligomer ; 837 [M+Na]+
  C42H70O15
  Trivial name: sieberoside II
  Compound class: triterpenoid glycoside
  
   
  
  Astragalus sieberi
  CSDB ID 61553 (all data & tools)