STRUCTURES OF MACROSTEMONOSIDE J,K AND L FROM ALLIUM MACROSTEMON BUNGE

Further studies by means of HPLC led to the isolation of two new furostanol saponins，macrostemonoside J and L，along with．one artifact macrostemonoside K from Allium macrostemon Bunge.On the basis of chemical evidences and spectral analysis(¹H，¹³C-NMR and FAB-MS)，the structure of macrostemonoside J(I)was elucidated aS(25R)-26-O-β-D-glucopyranosyl-22-hydroxy-5β-furost-2β，3β，26-triol-3-O-β-D-glucopyranosyl(1→2)-β-D-galactopyranoside：macrostemonoside K(II)as(25R)-26-O-β-D-glucopyranosyl-22-methoxy-5β-furost-2β，3β，26-triol-3-O-β-D-glucopyranosyl(1→2)-β-D-galactopyranoside；macrostemonoside L(III)as(25R)-26-O-β-D-glucopyranosyl-5β-furost-20(22)-ene-2β，3β，26-triol-3-O-β-D-glucopyranosyl(1→2)-β-D-galac．topyrancside．