19-NORPREGN-5(10)-ENE-3,20-DIONE, 9,11-EPOXY-17-HYDROXY-, CYCLIC BIS(1,2-ETHANEDIYL ACETAL), (11.ALPHA.)-
19-norpregn-5(10)-ene-3,20-dione, 9,11-epoxy-17-hydroxy-, cyclic bis(1,2-ethanediyl acetal), (11.alpha.)-