Levonorgestrel EP Impurity O

4,5-Dihydro-5α-methoxylevonorgestrel; 4,5-Dihydro-5a-methoxy-Levonorgestrel; 4,5-Dihydro-5a-methoxy D-(-)-Norgestrel;(5α,17α)-13-Ethyl-17-hydroxy-5-methoxy-18,19-dinorpregn-20-yn-3-one; (5R,8R,9S,10R,13S,14S,17S)-13-ethyl-17-ethynyl-17-hydroxy-5-methoxyhexadecahydro-3H-cyclopenta[a]phenanthren-3-one; 4,5-Dihydro-5α-methoxylevonorgestrel; Levonorgestrel Impurity O (IP); Dihydro-5-methoxylevonorgestrel; 13-Ethyl-17-hydroxy-5α-methoxy-18,19-dinor-17α-pregn-20-yn-3-one;