(1'-(4-Fluorophenyl)(ethylenedioxy))-21-hydroxy-19-norpregn-4-ene-3,20-dione 147963-99-3 19-Norpregn-4-ene-3,20-dione, 16,17-((1-(4-fluorophenyl)ethylidene)bis(oxy))-21-hydroxy-, (16alpha(R))- 4-Fpedhnped