3,3,20,20-Bis(ethylene-dioxy)-17α-hydroxy-5α,10α-epoxy-19-norpregna-9(11)-ene;(5alpha,10alpha)-5,10-Epoxy-17-hydroxy-19-norpregn-9(11)-ene-3,20-dione cyclic 3,20-bis(1,2-ethanediyl acetal)
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