Three new steroidal saponins were isolated from the fruits of Tribulus terr
estris, and their structures were elucidated as (25R,S)-5 alpha -spirostane
-12-one-3 beta -ol-3-O-beta -xylopyranosyl(1 -->2)-[beta -xylopyranosyl(1 -
->3)]-beta -glucopyranoside;26-O-beta -glucopyranosyl(25S)-5 alpha -furosta
ne-1 2-one-3 beta ,22 alpha ,26-triol-3-O-beta -glucopyrano syl(1 -->2)-bet
a -galactopyranoside; 26-O-beta -glucopyranosyl-(25S)-5 alpha -furostane-12
-one-3 beta ,22 alpha ,26-triol-3-O-beta -glucopyranosyl(1 -->4)-[alpha -rh
amnopyranosyl(1 -->2)]-beta -galactopyranoside, respectively, by spectrosco
pic analysis and color reaction.