Studies on the constituents of Asclepiadaceae plants. LVIII. The structures of five glycosides, cynatratoside-A, -B, -C, -D, and -E, from the Chinese drug "Pai-Wei," Cynanchum atratum BUNGE.
The chemical components of the Chinese crude drug Pai-Wei, dried root of C. atratum [used as an antifebrile and diuretic in China] (Asclepiadaceae), were studied. Five new oligoglycosides named cynatratoside-A, -B, -C, -D and -E (9) were isolated by column chromatography and their structures were determined on the basis of chemical and spectral evidence.