(6α,11β,16α,17α)-6,9-difluoro-11,17-dihydroxy-16-methyl-3-oxo-Androsta-1,4-diene-17-carboxylic Acid (6α,11β,16α,17α)-6,9-difluoro-17-[[(fluoromethyl)thio]carbonyl]-11-hydroxy-16-methyl-3-oxoandrosta-1,4-dien-17-yl Ester