4,5-Epoxy-5H-cyclopenta[a]phenanthrene,19-norpregn-20-yn-3-one deriv.; 17b-Hydroxy-19-nor-4b,5b-epoxy-17a-pregn-20-yn-3-one; 4b,5-Epoxy-17a-ethynyl-17-hydroxy-5b-estran-3-one; Norethindrone 4b,5b-epoxide; Norethisterone 4b,5b-epoxide
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