【单选题】【消耗次数：1】
卵巢分泌的雌激素主要是（ ）
①
雌二醇
②
雌三醇
③
孕酮
④
雌酮
参考答案：
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相关题目
【单选题】
雌二醇的口服效果很差，主要是在胃肠道被酶分?解破坏，为了提高其口服活性，主要的结构改造?方法是（）。
①
将3位羟基成酯
②
在17α位引入乙炔基
③
在17α位引入甲基
④
在16α位或16β位引入甲基
⑤
将3位羟基成醚
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