The bioassay-guided investigation of this fraction afforded
five new dammarane-type saponins, gypenosides GD1−GD5
(1−5), along with six known saponins (6−11). Herein are
described the structural elucidation of compounds 1−5, along
with the evaluation of the inhibitory effects on IL-6-induced
STAT3 activation of compounds 1−11.