4,4'-Pentamethylenebis(1-(p-sulfophenyl)-3-methyl-5-oxopyrazole) 65059-52-1 Benzenesulfonic acid, 4-(4-(5-(1,5-dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene)-1,3-pentadienyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)- EINECS 265-335-9 p-(4-(5-(1,5-Dihydro-3-methyl-5-oxo-1-(4-sulphophenyl)-4H-pyrazol-4-ylidene)penta-1,3-dienyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid