Silenosides A-C, triterpenoid saponins from Silene vulgaris

Three new triterpenoid saponins named silenosides A-C (1-3) were obtained f rom the roots of Silene vulgaris. Their structures were elucidated by spect ral and chemical methods as beta-D-galactopyranosyl-(1-->2)-beta-D-glucuron opyranosyl-3 beta-hydroxy-23-oxoolean-12-en-28-oic acid 28-O-beta-D-xylopyr anosyl(1-->3)-beta-D-xylopyranosyl(1-->4)-alpha-L-rhamnopyranosyl(1-->2)-be ta-D-fucopyranoside; 3-O-beta-D-galactopyranosyl(1-->2)-beta-D-glucuronopyr anosyl-3 beta,16 alpha-dihydroxy-23-oxoolean-12-en-28-oic acid 28-O-beta-d- xylopyranosyl(1-->4)-[beta-D-glucopyranosyl(1-->2)]-alpha-L-rhamnopyranosyl (1-->2)-beta-d-fucopyranoside; and 3-O-alpha-L-arabinopyranosyl(1-->3)-[bet a-D-galactopyranosyl(1-->2)]-beta-D-glucuronopyranosyl-3 beta,16 alpha-dihy droxy-23-oxoolean-12-en-28-oic acid 28-O-beta-D-xylopyranosyl(1-->4)-[beta- D-glucopyranosyl(1-->2)]-alpha-L-rhamnopyranosyl(1-->2)-beta-D-fucopyranosi de, respectively.