A new sapogenin named Julibrogenin A was isolated from the stem bark of Albizzia julibrissin Durazz (Albizziae Cortex). Based on chemical and spectral studies, their structure has been identified as 21-O-(2-hydroxymethyl-6-methyl-6-methoxyl-2,7-octadienoyl)-acacic acid. In addition, machaerinic acid lactone, machaerinic acid methylester, acacigenin B and julibrotriterpenoidal lactone A were also isolated from this plant and characterised.
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