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