(5A,11B)-11-[4-(Dimethylamino)phenyl]-5,17-dihydroxy-19-norpregn-9-ene-3,20-dione cyclic bis(1,2-ethanediyl acetal)126690-41-3100 % similar Mifepristone84371-65-340 % similar Ulipristal acetate126784-99-438 % similar