(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)- (+-)- 51267-65-3