A new spirosten delta-lactone saponin, named foliumin, was isolated fr
om the ethanolic extract of the aerial parts of Solanum amygdalifolium
and characterized, using NMR spectroscopy, mass spectrometry, methyla
tion analysis and specific chemical degradations, as (22S,23R,25R)-3 b
eta,15 alpha,23-trihydroxyspiro 3-O-[alpha-L-rhamnopyranosyl-(1 --> 2)
]-beta-D-glucopyranoside.