Two triterpene saponins acylated with monoterpenoid were isolated from the stem barks of Albizia julibrissin. Their structures were identified as 3-O--D-xylopyranosyl-(1→2)--L-arabinopyranosyl- (1→6)-6--D-glucopyrano-syl-21-O-[(6S)-2-trans-2-hydroxymethyl-6-methyl-6-O-D-quinovopyranosyl- 2,7-octadienoyl]-acacic acid-28-O--D-glucopyranosyl-(1→3)-[α-2-arabinofuranosyl-(1→4)-α-L-rhomno- pyranosyl-(1→2)--D-glucopyranosylester (1) and 3-O--D-xylopyranosyl-(1→2)--L- arabinopyranosyl- (1→6)--D-2-deoxy-2-acetamidoglucopyranosyl-21-O-[(6S)-2-trans-2-hydroxymethyl-6-methyl-6-O--D- quinovopyranosyl-2,7-octadienoyl]-acacic acid-28-O--D-glucopyranosyl-(1→3)--L-arabinofuranosyl- (1→4)--L-rhamnopyranosyl-(1→2)--D-glucopyranosyl ester (2) based on chemical and spectroscopic methods, respectively, named as Julibrosides J₂₅ and J_22. Julibrosides J₂₅ and J₂₂ showed marked activities against four kinds of cancer cell lines in a concentration of 100 g/mL assayed by SRB method.

Key words: Albizia julibrissin, acetamidoglucoside, julibroside J₂₅, julibroside J₂₂, triterpenoid saponin