(8S,9S,10S,13S,14S,17R)-13-ethyl-17-ethynyl-10,17-dihydroxy-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3(2H)-one;10?-Hydroxy Levonorgestrel; (17?)-13-Ethyl-10,17-dihydroxy-18,19-dinorpregn-4-en-20-yn-3-one; 13-Ethyl-10,17-dihydroxy-18,19-dinor-17?-pregn-4-en-20-yn-3-one; Levonorgestrel Impurity I (EP); (10-beta-Hydroxy Levonorgestrel)
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