1926-94-9 Dexamethasone 21-pivalate Dexamethasone 21-trimethylacetate Dexamethasone pivalate Dexamethasone trimethyl acetate Dexamethasone trimethylacetate EINECS 217-659-7 Opticortenol Pregna-1,4-diene-3,20-dione, 21-(2,2-dimethyl-1-oxopropoxy)-9-fluoro-11,17-dihydroxy-16-methyl-, (11beta,16alpha)- Pregna-1,4-diene-3,20-dione, 9-fluoro-11beta,17,21-trihydroxy-16alpha-methyl-, 21-pivalate