6alpha,9-difluoro-11beta,17,21-trihydroxy-16alpha-methylpregn-4-ene-3,20-dione 21-pivalate

21-(2,2-Dimethyl-1-oxopropoxy)-6α,9-difluoro-11β,17-dihydroxy-16α-methylpregn-4-ene-3,20-dione