MEDICAGENIC ACID SAPONINS FROM ASTER BATANGENSIS

Two new medicagenic acid saponins, named asterbatanoside J and K, were isolated from the roots of aster batangensis. On the basis of chemica l and spectral studies especially 2D NMR including COSY, HETCOR, HMQC, HOHAHA, TOCSY, ROESY and HMBC techniques, their structures were estab lished as a-D-glucopyranosyl-(1-->6)-beta-D-glucopyranosyl-2 beta,3 be ta-dihydroxy-olean-12-en-23 alpha,28-dioic ha-L-rhamnopyranosyl-(1-->2 )-beta-D-fucopyranoside and yranosyl-(1-->6)-beta-D-glucopyranosyl-med icagenic ha-L-rhamnopyranosyl-(1-->2)-beta-D-fucopyranside, respective ly.