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β-D-glucopyranosyl-[α-L-rhamnopyranosyl-(1→3)-βD-glucuronopyranosyl-(1→3)]-3β-hydroxyolean-12-ene28-oate 作为一种皂苷,有一个葡萄糖醛酸连接到碳 C-3,并从单胞菌中分离。