Saponins from Zygophyllum gaetulum

Three new bisdesmosidic triterpene saponins, zygophylosides I (1), L (2) and M (3), and three known quinovic acid glycosides were isolated from Zygophyllum gaetulum. The new compounds were determined to be 3β-O-α-l-rhamnopyranosyl-(1→2)-α-l-arabinopyranosyl-(1→2)-β-d-glucopyranosylurs-20(21)-en-28-oic acid 28-O-[β-d-2-O-sulfonylglucopyranosyl] ester (1), 3β-O-[α-l-rhamnopyranosyl-(1→2)-α-l-arabinopyranosyl-(1→2)-β-d-glucopyranosyl]urs-20(21)-en-28-oic acid 28-O-[β-d-glucopyranosyl] ester (2), and 3β-O-β-d-quinovopyranosyl-27-nor-olean-12-en-28-oic acid 28-O-β-d-glucopyranosyl ester (3) by use of 1D and 2D NMR techniques.