34142-26-2 Benzenesulfonic acid, 4-(4-((1,5-dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene)methyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)- EINECS 251-848-5 p-(4-((1,5-Dihydro-3-methyl-5-oxo-1-(4-sulphophenyl)-4H-pyrazol-4-ylidene)methyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid