Two New Saponins from Solidago gigantea

Abstract Two new triterpenoid saponins, named giganteasaponin 5 and giganteasaponin 6, were isolated from the aboveground parts of Solidago gigantea and were defined to be 3-O-[ -D-Apio-D-furanosyl-(1 3)-D-glucopyranosyl-(1 3)-D-glucopyranosyl]-28-O { -L-rhamnopyranosyl-(1 3)-D-xylopyranosyl-(1 4)[ -D-xylopyranosyl-(1 3)]-L-rhamnopyranosyl-(1 2) [ -L-rhamnopyranosyl-(1 3)]-Dxylopyranosyl}-Bayogenin respectively 3-O[ -D-Apio-D-furanosyl-(1 3)-Dgluco-pyranosyl-(1 3)-D-glucopyranosyl]-28-O { -D-galactopyranosyl-(1 2)L-rhamnopyranosyl-(1 3)-D-xylopyranosyl-(1 4)[ -D-xylopyranosyl-(1 3)]-L-rhamnopyranosyl-(1 2) [ -L-rhamnopyranosyl-(1 3)]-D-xylopyranosyl}Bayogenin. The structures were established on the basis of chemical degradation, extensive MS studies and NMR investigations as well.