A new hemisynthetic oleanane saponin: 4',2\",3\",4\",6\"-penta-O-acetyl-6'-O-methyl-3-O-β-D-glucopyranosyl-(1→2)-β-D-glucuronopyranosyl
oleanolic acid (2) was obtained after acetylation and methylation reaction on 3-O-β-D-glucopyranosyl-(1→2)-β-D-glucuronopyranosyl oleanolic acid (1). Its structure
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