Abstract :
[en] Five new triterpene saponins 1-5 were isolated from the roots of Muraltia ononidifolia E. MEY along with the two known saponins 3-O-[O-beta-D-glucopyranosyl-(1 --> 2)-beta-D-glucopyranosyl]medicagenic acid 28-[O-beta-D-xylopyranosyl-(l --> 4)-O-alpha-L-rhamnopyranosyl-(1 --> 2)-alpha-L-arabinopyranosyl] ester and 3-O-(beta-D-glucopyranosyl)medicagenic acid 28-[O-alpha-L-rhamnopyranosyl-(1 --> 2)-alpha-L-arabinopyranosyl] ester (medicagenic acid = (4alpha,2beta,3beta)-2,3-dihydroxyolean-12-ene-23,28-dioic acid). Their structures were elucidated mainly by spectroscopic experiments, including 2D-NMR techniques, as 3-O-(beta-D-glucopyranosyl)medicagenic acid 28-[O-beta-D-apiofuranosyl-(l --> 3)-O-beta-D-xylopyranosyl-(1 --> 4)-O-alpha-L-rhamnopyranosyl-(1 --> 2)-alpha-L-arabinopyranosyl] ester (1), 3-O-(beta-D-glucopyranosyl)medicagenic acid 28-{[O-beta-D-xylopyranosyl-(1 --> 4)-O-[beta-D-apiofuranosyl-(1 --> 3)]-O-alpha-L-rhamnopyranosyl-(1 --> 2)-alpha-L-arabinopyranosyl} ester (2), 3-O-[O-beta-D-glucopyranosyl-(1 --> 2)-beta-D-glucopyranosyl]medicagenic acid 28-[O-beta-D-xylopyranosyl-(1 --> 4)-O-[beta-D-apiofuranosyl-(1 --> 3)]-O-alpha-L-rhamnopyranosyl-(1 --> 2)-alpha-L-arabinopyranosyl] ester (3), 3-O-[O-beta-D-glucopyranosyl-(1 --> 2)-beta-D-glucopyranosyl]medicagenic acid 28-[O-alpha-L-rhamnopyranosyl-(1 --> 2)-alpha-L-arabinopyranosyl] ester (4), and 3-O-[O-beta-glucopyranosyl-(1 --> 2)-beta-D-glucopyranosyl]medicagenic acid (5).
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