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双烯孕腈(Dienogestril)又名STS 557,化学名:17β-羟基-17α氰甲基-4,9(10)-雌甾二烯-3-酮。结构如下:
Dienogestril also known as STS 557, chemical name: 17β-hydroxy-17α cyanomethyl-4,9 (10) -estrastil-3-one. Structure is as follows: