AC1L56O5;51267-65-3;(4beta,5beta,17alpha)-(+-)-4,5-Epoxy-13-ethyl-17-hydroxy-18,19-dinorpregn-20-yn-3-one;18,19-Dinorpregn-20-yn-3-one, 4,5-epoxy-13-ethyl-17-hydroxy-, (4beta,5beta,17alpha)- (+-)-
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