左炔诺孕酮Levonorgestrel cas：797-63-7
左炔诺孕酮杂质B Levonorgestrel Impurity B ：
13-Ethyl-17-hydroxy-18,19-dinor-17α-pregn-5(10)-en-20-yn-3-one (Levo Norgestrel Impurity) 规格1mg
左炔诺孕酮杂质C Levonorgestrel Impurity C :
13-Ethyl-3-ethynyl-18,19-dinor-17α-pregna-3,5-dien-20-yn-17-ol (Levo Norgestrel Impurity) 规格2.5mg
左炔诺孕酮杂质D Levonorgestrel Impurity D：
13-Ethyl-18,19-dinor-17α-pregn-4-en-20-yn-17-ol (Levo Norgestrel Impurity) 规格2.5mg