Mimonoside D: a new triterpenoid saponin from Sauvalle (Fabaceae).

A new triterpenoid saponin (Mimonoside D: 3---L-arabinopyranosyl-3-hydroxyolean-12-en-28-oic acid 28---D-xylopyranosyl-(1→2)--D- glucopyranoside ester ()) was isolated from the aerial parts of Sauvalle together with nine known compounds: 7,4'-dihydroxyflavone (), kaempferol (), lupeol (), betulinic acid (), -sitosterol (), -sitosterol-3---D-glucopyranoside (), lutein (), 5,2'-dihydroxy-7,4',5'-trimethoxyflavone () and vitexin (). Their structures were elucidated on the basis of spectroscopic (1D and 2D nuclear magnetic resonance) and high-resolution mass spectrometric data as well as by comparison of their spectral data with those of related compounds. Compounds , and had already been isolated from , while compounds , , and have been isolated from other species.