Synonyms: Pregna-1,4-diene-3,20-dione,9-fluoro-11b,17,21-trihydroxy-16a-methyl-,21-(3,3-dimethylbutyrate) (8CI); Butyric acid, 3,3-dimethyl-, 21-ester with9-fluoro-11b,17,21-trihydroxy-16a-methylpregna-1,4-diene-3,20-dione(8CI); Decadron TBA; Dexamethasone tert-butylacetate;Dexamethasone-21-tert-butylacetate