Synonyms: Corticosterone,9-fluoro-16a,17-dihydroxy-6a-methyl-, cyclic 16,17-acetalwith acetone (6CI); Pregn-4-ene-3,20-dione, 9-fluoro-11b,16a,17,21-tetrahydroxy-6a-methyl-, cyclic 16,17-acetal with acetone (8CI);2H-Naphth[2',1':4,5]indeno[1,2-d][1,3]dioxole, pregn-4-ene-3,20-dione deriv.; 6a-Methyl-8a-fluoro-16a-hydroxyhydrocortisone16,17-acetonide