356-12-7 6.alpha.,9-Difluoro-11.beta.,16.alpha.,17,21-tetrahydroxypregna-1,4-diene-3,20-dione, cyclic 16,17-acetal with acetone, 21-acetate Bestasone Biscosal Cortalar Fluocinolide Fluocinolone acetonide 21-acetate Fluocinolone acetonide acetate Fluocinonide Fluzon Lidex Metosyn NSC101791 Pregna-1,4-diene-3,20-dione, 21-(acetyloxy)-6,9-difluoro-11-hydroxy-16,17-[(1-methylethylidene)bis(oxy)]-, (6.alpha.,11.beta.,16.alpha.)- Pregna-1,4-diene-3,20-dione, 6.alpha.,9-difluoro-11.beta.,16.alpha.,17,21-tetrahydroxy-, cyclic 16,17-acetal with acetone, 21-acetate Straderm Synalar acetate Topsymin Topsyn