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A new triterpenoid saponin (Mimonoside D: 3- O - α -L-arabinopyranosyl-3 β -hydroxyolean-12-en-28-oic acid 28- O - β -D-xylopyranosyl-(1→2)- β -D- glucopyranoside ester ( 1 )) was isolated from the aerial parts of  Mimosa diplotricha  Sauvalle together with nine known compounds: 7,4′-dihydroxyflavone ( 2 ), kaempferol ( 3 ), lupeol ( 4 ), betulinic acid ( 5 ),  β -sitosterol ( 6 ),  β -sitosterol-3- O - β -D-glucopyranoside ( 7 ), lutein ( 8 ), 5,2′-dihydroxy-7,4′,5′-trimethoxyflavone ( 9 ) and vitexin ( 10 ). Their structures were elucidated on the basis of spectroscopic (1   D and 2   D nuclear magnetic resonance) and high-resolution mass spectrometric data as well as by comparison of their spectral data with those of related compounds. Compounds  2 ,  7  and  8  had already been isolated from  M. diplotricha , while compounds  3 ,  4 ,  5  and  6  have been isolated from other  Mimosa  species. Compound  2  moderately inhibited  Proteus mirabilis  (MIC = 32   µg/mL), weakly inhibited  Pseudomonas aeruginosa  (MIC = 64   µg/mL) and very weakly inhibited  Staphylococcus aureus  (MIC = 128   µg/mL) and  Enterococus faecalis  (MIC = 128   µg/mL).

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