Carbamic acid,[2-[[1-[4-[[2-[2,4-bis(1,1-dimethylpropyl)phenoxy]-1-oxobutyl]amino]phenyl]-4,5-dihydro-3-[[2-methoxy-4-[(methylsulfonyl)amino]phenyl]amino]-5-oxo-1H-pyrazol-4-yl]azo]-4-(1-methylpropyl)phenyl]-, ethyl ester