CHOLESTANE-TYPE AND PREGNANE-TYPE GLYCOSIDES FROM THE ROOTS OF TRIBULUS CISTOIDES

From the methanolic extract of the roots of Tribulus cistoides the car dioactive saponin-3, which is known to occur in the leaves, was isolat ed along with tribulosin, a pregnane-type glycoside and eight new chol estane glycosides. D-(+)-Pinitol and sucrose were major constituents. The structures were established by spectroscopic studies of the isolat ed compounds, their acetylated derivatives and their hydrolysation pro ducts. Chemical conversions revealed the configurations at C-22 and C- 25, respectively.