1991 Volume 39 Issue 7 Pages 1699-1703
Six oleanolic aicd glucuronide saponins, scaberosides B1, B2, B3, B4, B5 and B6 were isolated from the root of Aster scaber THUNB. (Compositae) as their methyl esters, and their structures were determined based on spectral and cheimical evidence. Scaberosides have a common prosapogenin structure, oleanolic acid 3-O-glucopyranosiduronic acid, and differ in the structures of the 28-O-linked sugar moieties.Scaberoside B1 is a 28-[α-L-arabinopyranosyl] ester, scaberoside B2, a 28-[β-D-xylopyranosyl] ester, scaberoside B3, a 28-[O-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranosyl] ester, and scaberoside B4, a 28-[O-α-L-rhamnopyranosyl-(1→2)-β-D-xylopyranosyl] ester, scaberoside B5, a 28-[O-β-D-xylopyranosyl-(1→4)-O-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranosyl] ester, scaberoside B6, a 28-{O-β-xylopyranosyl-(1→4)-O-α-L-rhamnopyranosyl-(1→2)-β-D-xylopyranosyl] ester of the prosapogenin.