The structure of cephalaria saponin B, isolated from Cephalaria transs
ylvanica was elucidated as 3-O-{[beta-D-xylopyranosyl(1 --> 4)-alpha-L
-rhamnopyranosyl(1 --> a-D-xylopyranosyl]-[28-O-beta-D-glucopyranosyl]
}-3 beta,23-dihydroxy-12(13)-oleanene-28-oic acid.