Carbamic acid, [[4′-[[3-butyl-1,5-dihydro-1-[4-nitro-2-(trifluoromethyl)phenyl]-5-oxo-4H-1,2,4-triazol-4-yl]methyl][1,1′-biphenyl]-2-yl]sulfonyl]-, 1,1-dimethylethyl ester