79811-16-8 Benzenesulfonic acid, 4-(4-(5-(1,3-dibutyltetrahydro-2,4,6-trioxo-5(2H)-pyrimidinylidene)-1,3-pentadienyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)- NK 2935 WW 781 WW-781