Ethanesulfonic acid,2-[[4-[[3-(acetylamino)-1-[4-[[[3-(5,5-dimethyl-3-octadecyl-2-thiazolidinyl)-4-hydroxyphenyl]amino]sulfonyl]phenyl]-1,5-dihydro-5-oxo-4H-pyrazol-4-ylidene]amino]-3-methylphenyl]ethylamino]-, monosodium salt