Chemical composition of shallot (Allium ascalonicum Hort.).

@article{Fattorusso2002ChemicalCO,
  title={Chemical composition of shallot (Allium ascalonicum Hort.).},
  author={Ernesto Fattorusso and Maria Iorizzi and Virginia Lanzotti and Orazio Taglialatela‐Scafati},
  journal={Journal of agricultural and food chemistry},
  year={2002},
  volume={50 20},
  pages={
          5686-90
        }
}
An extensive phytochemical analysis of the polar extracts from bulbs of shallot, Allium ascalonicum Hort., led to the isolation of two new furostanol saponins, named ascalonicoside A1/A2 (1a/1b) and ascalonicoside B (4), respectively, along with compounds 2a and 2b, most likely extraction artifacts. On the basis of 2D NMR and mass spectrometry data, the structures of the novel compounds were elucidated as furost-5(6)-en-3beta,22alpha-diol 1beta-O-beta-D-galactopyranosyl 26-O-[alpha-L… 
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Further studies by means of preparative HPLC led to the isolation of two new furostanol saponins, macrostemonosides G (1) and I (3), along with an artifact, macrostemonoside H (2) from the bulbs of
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