387-64-4 FDA 0066 NSC19622 Pregn-4-ene-3,20-dione, 21-fluoro-11,17-dihydroxy-6-methyl, (6.alpha.,11.beta.)- Pregn-4-ene-3,20-dione, 21-fluoro-11.beta.,17-dihydroxy-6.alpha.-methyl- Progesterone, 21-fluoro-11.beta.,17-dihydroxy-6.alpha.-methyl- SK 22937