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Tribulin, a New Steroidal Saponin from the Aerial Parts of Tribulus terrestris
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From the aerial parts of Tribulus terrestris, a new steroidal saponin, Diosgenin 3-O-[{α -L-rhamnopyranosyl-(1→3)} {α -L-rhamnopyranosyl- (1→4)}]-β-D-glucopyranosyl-(1→4)-β-D-glucopyranoside namely tribulin has been isolated together with six known compounds; scoparon, campesterol, stigmasterol, βsitosterol, Diosgenin 3-O-[{α -Lrhamnopyranosyl-( 1→4)-β-D-glucopyranoside and D-(+)-pinitol. The structure of the new saponin was elucidated on the basis of spectroscopic analyses including 1D-NMR and mass spectroscopy (EI-MS) and chemical reactions.
Keywords
Tribulus terrestris, Zygophyllaceae, Steroidal Saponin, Tribulin.
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