preferred_name: 17-(((((6.ALPHA.,11.BETA.,16.ALPHA.,17.ALPHA.)-6,9-DIFLUORO-11,17-DIHYDROXY-16-METHYL-3-OXOANDROSTA-1,4-DIEN-17-YL)CARBONYL)DITHIO)CARBONYL)-6,9-DIFLUORO-11-HYDROXY-16-METHYL-17-(1-OXOPROPOXY)ANDROSTA-1,4-DIEN-3-ONE