4,9-DIFLUORO-11.BETA.,21-DIHYDROXY-16.ALPHA.,17-(1-METHYLETHYLIDENEDIOXY)PREGNA-1,4-DIENE-3,20-DIONE,
4,9-difluoro-11.beta.,21-dihydroxy-16.alpha.,17-(1-methylethylidenedioxy)pregna-1,4-diene-3,20-dione,