A new glycoside from Polygala tenuifolia Willd

A new triterpenoid glycoside,3-β-O-β-D-glucopyranosyl presenegenin 28-O-α-L-arabipyranosyl(1→3)-β-D-xylopyranosyl(1→4)-[β-D-apiofuranosyl(1→3)]-α-L-rhanmopyranosyl(1→2)-[α-L-rhamnopyranosyl(1→3)]-β-D-fucopyranosyl ester (1) was isolated from the Polygala tenuifolia Willd.,together with two known saponins,including polygalasaponinⅩⅩⅣ (2) and polygalasaponinⅩⅩⅧ(3).The structure of new compound was elucidated by spectroscopic methods.