英文别名(17R)-13-Ethyl-3-methoxy-18,19-dinorpregna-2,5(10)-dien-20-yn-17-ol; (8R,9S,13S,14S,17R)-13-ethyl-17-ethynyl-3-methoxy-4,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-17-ol; Levonorgestrel EP impurity T; 18,19-Dinorpregna-2,5(10)-dien-20-yn-17-ol, 13-ethyl-3-methoxy-, (17α)-; (17α)-13-Ethyl-3-methoxy-18,19-dinorpregna-2,5(10)-dien-20-yn-17-ol (Levonorgestrel Impurity T); (17a)-13-Ethyl-3-methoxy-18,19-dinorpregna-2,5(10)-dien-20-yn-17-ol (Levonorgestrel Impurity T) 
