(18β,20β)-1-{2-[methyl (2,3,4-tri-O-acetyl-1-thio-β-D-glucopyranosyl)uronate]ethylthio}-11-oxo-olean-2,12-dien-29-oic acid 在
sodium methylate 作用下,
以
甲醇 为溶剂,
反应 1.0h,
生成 (3α,18β,20β)-3-{2-[methyl (1-thio-β-D-glucopyranosyl)uronate]ethylthio}-11-oxo-olean-2,12-en-29-oic acid 、 (3β,18β,20β)-3-{2-[methyl (1-thio-β-D-glucopyranosyl)uronate]ethylthio}-11-oxo-olean-2,12-en-29-oic acid