A New Minor Hederagenin-Type Triterpene Saponin from Cassia fistula.

A new hederagenin-type triterpene saponin was found in the aqueous-ethanolic extract of the seeds of Cassia fistula L. The structure of this compound was established as 3-O-β-D-xylopyranosyl-(1→2)-β-D- xylopyranosylhederagenin 28-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl ester (1), mainly by extensive 2D NMR analysis in combination with spectral data of known compounds. [ABSTRACT FROM AUTHOR]