STEROIDAL GLYCOSIDES FROM TRIBULUS-TERRESTRIS

In addition to hecogenin 3-O-beta-D-glucopyranosyl(1 --> 4)-beta-D-gal actopyranoside, two new steroidal saponins were isolated from the aeri al parts of Tribulus terrestris L. On the basis of chemical and spectr oscopic evidence, especially 2D NMR spectroscopic techniques, the stru ctures of the new saponins were established as beta-D-glucopyranosyl-3 -O-[{beta-D-xylopyranosyl(1 --> 3)}{beta-D-galactopyranosyl(1 --> 2)}- beta-D-glucopyranosyl (1 --> 4)-beta-D-glucopyranosyl]-5 alpha-furost- 20(22)-en-12-one-3 beta,26-diol and beta-D-glucopyranosyl-3-O-[{beta-D -xylopyranosyl(1 --> 3)}{beta-D-galactopyranosyl(1 --> 2)}-beta-D-gluc opyranosyl(1 --> 4)-beta-D-glucopyranosyl]-5 alpha-furostan-12-one-3 b eta,22,26-triol.