The structures of four triterpenoid saponins isolated from the seed of Trifolium incarnatum

Abstract

A novel bisdesmosidic saponin, .3-O-[α-L-rhamnopyranosyl(1→2)-ß-D-galactopytanosyl]-22-O[ß-D-galactopytanosyl(l→2)-ß-D-galactopytanosyl]olean-12-ene-24-ol has been isolated from the seed of the clover, Trifolium incarnatum. The structure of this and of three other structulally related saponins, 3-O-(α-L-rhamnopyranosy)olean-12-ene-22, 24-diol, soyasaponin I and soyasaponin III have been assigned on the basis of spectral and chemical evidence.