Synonyms: Pregna-1,4,9(11)-triene-3,20-dione,6a-fluoro-16a,17,21-trihydroxy-, cyclic 16,17-acetal with acetone,21-acetate (7CI,8CI); 2H-Naphth[2',1':4,5]indeno[1,2-d][1,3]dioxole, pregna-1,4,9(11)-triene-3,20-dione deriv.; 21-Acetoxy-6a-fluoro-16a,17-(isopropylidenedioxy)pregna-1,4,9(11)-triene-3,20-dione