英文别名(8R,9S,10R,13R,14S,17R)-13-ethyl-17-ethynyl-17-hydroxy-1,2,8,9,10,11,12,14,15,16-decahydrocyclopenta[a]phenanthren-3-one; (17α)-13-Ethyl-17-hydroxy-18,19-dinorpregna-4,6-dien-20-yn-3-one; 6,7-Dehydro Levonorgestrel; Levonorgestrel EP impurity M; Norgestrel 6(7)-Dehydro Impurity; Levonorgestrel EP IMP M; Levonorgestrel Impurity 13; 18,19-Dinorpregna-4,6-dien-20-yn-3-one, 13-ethyl-17-hydroxy-, (17α)- 
