英文别名Levonorgestrel Impurity 23; Levonorgestrel EP impurity W; Levonorgestrel Impurity W; 18,19-Dinorpregna-5,7,9-trien-20-yn-3-one, 13-ethyl-17-hydroxy-, (17α)-; 13-Ethyl-17-hydroxy-18,19-dinor-17α-pregna-5,7,9-trien-20-yn-3-one; (13S,14S,17R)-13-Ethyl-17-ethynyl-17-hydroxy-4,11,12,13,14,15,16,17-octahydro-1H-cyclopenta[a]phenanthren-3(2H)-one; (13S,14S,17R)-13-ethyl-17-ethynyl-17-hydroxy-1,2,4,11,12,14,15,16-octahydrocyclopenta[a]phenanthren-3-one; Levonorgestrel impurity W [EP] 
