Synonyms: 19-Norpregna-5(10),9(11)-diene-3,20-dione,17-hydroxy-, cyclic bis(1,2-ethanediyl acetal) (9CI);3,20-Bis(ethylenedioxy)-19-norpregna-5(10)9(11)dien-17-ol;17-Hydroxy-19-norpregna-5(10),9(11)-diene-3,20-dione cyclic bis(1,2-ethanediyl acetal);