[(2s)-1-[4-cyano-3-(trifluoromethyl)anilino]-3-(4-fluorophenyl)sulfonyl-2-methyl-1-oxopropan-2-yl] (1r,4r)-1,7,7-trimethyl-2-oxo-3-oxabicyclo[2.2.1]heptane-4-carboxylate