336-77-6 NSC47440 Pregn-4-ene-3,20-dione (8CI), 17,21-epoxy-9-fluoro-11.beta.-hydroxy- Progesterone, 17,21-epoxy-9-fluoro-11.beta.-hydroxy- Spiro[17H-cyclopenta[a]-phenanthrene-17,2'-oxetane]-3(2H),3'-dione,9.alpha.-fluoro-1,6,7,8,9,10,11,12,13,14,15,16-dodecahydro-11.beta.-hydroxy-10.beta.,13.beta.-dimethyl-