51596-04-4 Benzenesulfonic acid, 4-(4,5-dihydro-4-((5-hydroxy-3-methyl-1-(4-sulfophenyl)-1H-pyrazol-4-yl)methylene)-3-methyl-5-oxo-1H-pyrazol-1-yl)- EINECS 257-311-1 NSC 166359 p-(4,5-Dihydro-4-((5-hydroxy-3-methyl-1-(4-sulphophenyl)-1H-pyrazol-4-yl)methylene)-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid