(17beta(S))-17-(2-Fluoro-1-oxopropyl)-17-methylestra-4,9-dien-3-one 128855-74-3 21(R)-Fluoro-R5020 21(S)-Fluoro-R5020 21-F-R 5020 21-Fluoropromegestone Estra-4,9-dien-3-one, 17-(2-fluoro-1-oxopropyl)-17-methyl-, (17beta(S))-