Two new furostanol saponins from the seeds of Allium cepa L.

Phytochemical analysis of the n-BuOH extract from the seeds of Allium cepa L. led to isolation of four furostanol saponins, two of which were new compounds, named ceparoside A (1a) and ceparoside B (2a). The chemical structures of the new compounds were elucidated through a combination of NMR, MS spectral data and chemical analysis.