(8R,9S,13S,14S,17R)-13-ethyl-17-ethynyl-3-methoxy-4,6,7,8,9,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-ol;(17?)-13-Ethyl-3-methoxy-18,19-dinorpregna-2,5(10)-dien-20-yn-17-ol (Levonorgestrel Impurity T);13-Ethyl-3-methoxy-18,19-dinor-17?-pregna-2,5(10)-dien-20-yn-17-ol;
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