Synonyms: Pregn-4-ene-3,20-dione,12a-fluoro-11b,16a,17-trihydroxy-, cyclic 16,17-acetal with acetone(7CI,8CI); 2H-Naphth[2',1':4,5]indeno[1,2-d][1,3]dioxole,pregn-4-ene-3,20-dione deriv.; 12a-Fluoro-11b,16a,17-trihydroxypregn-4-ene-3,20-dione,16,17-acetonide