The absolute stereochemistry of blumenol C glucoside and byzantionoside B was revised here as (6R,9S)- and (6R,9R)-9-hydroxymegastigman-4-en-3-one 9-O-beta-D-glucopyranosides, respectively, by modified Mosher's method. The empirical rules of (13)C-NMR chemical shift to determine the absolute stereochemistry of C-9 of 9-hydroxymegastigmane 9-O-beta-D-glucopyranoside were also discussed.

中文翻译：

---

Blumenol C葡萄糖苷和拜占庭苷B的结构修改。

此处将Blumenol C糖苷和拜占庭苷B的绝对立体化学分别修订为（6R，9S）-和（6R，9R）-9-hydroxymegastigman-4-en-3-one 9-O-beta-D-glucopyranosides，通过修改的莫舍尔方法。还讨论了（13）C-NMR化学位移确定9-羟基大麦角9-O-β-D-吡喃葡萄糖苷C-9的绝对立体化学的经验规则。