Novel steroidal glycosides 2-4, 6-11, 13-19 and 20 were isolated from
the roots of Cynanchum caudatum M. (Asclepiadaceae). The structures of
these steroidal glycosides were determined on the basis of spectral a
nd chemical evidence. AlI of these glycosides contain 2,6-dideoxyhexop
yranoses as component sugars, and their structures were elucidated as
esterified pregnane-type.