英文同义词: | 17-Ethinyl-17-hydroxy-18-methylestra-5(10),9(11)dien-3-one-3-ethylene ketal;17-Ethinyl-18-methylestra-5(10),9(11)dien-17-ol-3-one-3-ethylene;18,19-Dinorpregna-5(10),9(11)-dien-20-yn-3-one, 13-ethyl-17-hydroxy-, cyclic 1,2-ethanediyl acetal, (17α)-;Cytosine Impurity 5 |