TRITERPENOID SAPONINS FROM BERNEUXIA-THIBETICA

Four triterpenoid saponins were isolated from Berneuxia thibetica. On the basis of chemical and spectroscopic evidence, three new saponins, berneuxia saponins A, B and C, were elucidated as 21-tig-loylbarringto genol C-3 beta-O-alpha-L-rhamnopyranosyl(l --> 2)-beta-D-galactopyrano syl(l --> 3)[beta-D -glucopyranosyl (1 --> 2)-beta-D-glucuronopyranosi de], 28-tigloylbarringtogenol C-3 beta-O-alpha-L-rhamnopyranosyl( 1 -- > 2)-beta-D-galactopyranosyl(l 1 --> 3)[beta-D-glucopyranosyl(l --> 2) -beta-D-glucuronopyranoside] and 16 xydlean-12-en-21-one-3-O-alpha-L-r hamnopyranosyl(l --> 2)-beta-D-galactopyranosyl(l --> 3)[beta-D-glucop yranosyl(l --> 2)-beta-D-glucuronopyranoside]. The known saponin was d esacyl jegosaponin. (C) 1998 Elsevier Science Ltd. All rights reserved .