Studies on the constituents of Clematis species. I. On the saponins of the root of Clematis chinensis Osbeck. 1.

Abstract

Four triterpenoid saponins, which were tentatively named prosapogenins CP2, CP6, CP7 and CP8, were isolated from the alkaline hydrolysate of crude saponin obtained from Clematis chinensis OSBECK. On the basis of chemical and physicochemical evidence, they were characterized as follows : CP2 (I), oleanolic acid 3-O-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranoside ; CP6 (III), hederagenin 3-O-β-D-ribopyranosyl-(1→3)-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranoside ; CP7 (VII), oleanolic acid 3-O-β-D-glucopyranosyl-(1→4)-β-D-ribopyranosyl-(1→3)-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranoside ; CP8 (IX), hederagenin 3-O-β-D-glucopyranosyl-(1→4)-β-D-ribopyranosyl-(1→3)-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranoside.