甾体皂苷结构特点有

问题：

A . 具有环戊烷骈多氢菲母核结构
B . 苷元由30个碳原子组成
C . 为酸性皂苷
D . C-20位上的甲基都为a构型
E . 一般C-3位上的羟基首先与糖结合成苷

参考答案：A,D,E

参考解析：

本题暂无解析

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