[Structure determination of saponin XI, XII and XIII from Dipsacus asper Wall]

Three new triterpenoid glycosides (XI, XII and XIII) were isolated from the ethanol extract of the roots of Dipsacus asper Wall. Their structures were deduced as 3-O-[beta-D-glucopyranosyl(1-->4)][alpha-L-rhamnopyranosyl (1-->3)]- beta-D-glucopyranosyl(1-->3)-alpha-L-rhamnopyranosyl(1-->2)-alpha- arabinopyranosyl-hederagenin (XI), 28-O-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranosyl ester of XI (XII) and 3-O-[beta-D-xylopyranosyl(1-->4)-beta-D-glucopyranosyl (1-->4)][alpha-L-rhamnopyranosyl(1-->3)]-beta-D-glucopyranosyl(1-->3)- alpha-L-rhamnopyranosyl(1-->2)-alpha-arabinopyranosyl-oleanolic.ac id 28-O-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranosyl ester (XIII), respectively, based on spectral and chemical analysis.