A steroidal saponin, named tuberoside, together with seven known compounds,
were isolated from the seeds of Allium tuberosum Rottl. ex Spreng. Its str
ucture was established by spectroscopic data, hydrolysis, and comparison wi
th spectral data of known compounds to be (2 alpha, 3 beta, 5 alpha, 25S)-2
,3,27-trihydroxyspirostane 3-O-alpha -L-rhamnopyranoyl-(1-->2)-O-[alpha -L-
rhamnopyranoyl-(1-->4)](beta -D-glucopyranoside. (C) 2001 Published by Else
vier Science Ltd.