Synonyms: Pregn-4-ene-3,20-dione,9-fluoro-11b,16a,17,21-tetrahydroxy-, 21-acetate, 16,17-acetal withacetophenone (8CI); 2H-Naphth[2',1':4,5]indeno[1,2-d][1,3]dioxole,pregn-4-ene-3,20-dione deriv.; 9a-Fluoro-11b,16a,17,21-tetrahydroxypregn-4-ene-3,20-dione,cyclic 16,17-acetal with acetophenone, 21-acetate