Synonyms: (5a,11b)-11-[4-(Dimethylamino)phenyl]-5,17-dihydroxy-19-norpregn-9-ene-3,20-dione cyclic bis(1,2-ethanediyl acetal);3,3,3,20,20-Bis(ethylene-dioxy) -5α,17α-dihydroxy-11β-[4-(N, N-diMethylaMino)-phenyl]-19-norpregna-9(11)-ene;3,3,3,20,20-Bis(ethylene-dioxy) -5alpha,17alpha-dihydroxy-11beta-[4-(N, N-diMethylaMino)-phenyl]-19-norpregna-9(11)-ene;3,3,20,20-Bis(ethylene-dioxy) -5α, 17α-dihydroxy-11β- 4-(N,N-diMethylaMino) -phenyl -19-norpregna-9(11)-ene