336-77-6 AIDS-124724 AIDS124724 NSC47440 Pregn-4-ene-3,20-dione , 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-