Synonyms: Pregna-1,4-diene-3,20-dione,6a,9,21-trifluoro-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,pregna-1,4-diene-3,20-dione deriv.; 6a,9a,21-Trifluoro-11b,16a,17a-trihydroxypregna-1,4-diene-3,20-dione-16,17-acetonide