13-Ethyl-17-hydroxy-18,19-dinor-17alpha-pregn-5(10)-en-20-yn-3-one(左炔诺孕酮杂质)/13-Ethyl-17-hydroxy-18,19-dinor-17alpha-pregn-5(10)-en-20-yn-3-one (Levo Norgestrel Impurity)
13-Ethyl-18,19-dinor-17alpha-pregn-4-en-20-yn-17-ol(左炔诺孕酮杂质)/13-Ethyl-18,19-dinor-17alpha-pregn-4-en-20-yn-17-ol (Levo Norgestrel Impurity)
13-Ethyl-3-ethynyl-18,19-dinor-17alpha-pregna-3,5-dien-20-yn-17-ol(左炔诺孕酮杂质)/13-Ethyl-3-ethynyl-18,19-dinor-17alpha-pregna-3,5-dien-20-yn-17-ol (Levo Norgestrel Impurity)
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