6alpha-fluoro-17,21-dihydroxy-16alpha-methylpregna-1,4,9(11)-triene-3,20-dione 21-pivalate

21-(2,2-Dimethyl-1-oxopropoxy)-6α-fluoro-17-hydroxy-16α-methylpregna-1,4,9(11)-triene-3,20-dione