A synthetic estrogen, C21H26O2, used in combination with a progestin in oral contraceptive preparations.

炔雌醇甲醚一种合成的雌激素，化学式为c21h26o2，与。

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A synthetic estrogen, C21H26O2, used in combination with a progestin in oral contraceptive preparations.

炔雌醇甲醚一种合成的雌激素，化学式为c21h26o2，与。

youdao