20,20-ethanediyldioxy-11β,17,21-trihydroxy-19-nor-pregn-4-en-3-one
16α,17-epoxy-3-methoxy-19-nor-pregna-1,3,5(10)-trien-20-one
20,20-(ethylenedioxy)-3-methoxy-17α-hydroxy-19-norpregna-1,3,5(10)-triene
20,20-ethanediyldioxy-3-methoxy-19-nor-pregna-2,5(10)-dien-17-ol
11β-acetoxy-20,20-ethanediyldioxy-3-methoxy-19-nor-pregna-1,3,5(10)-triene-17,21-diol