Einecs 245-997-5

4-Hydroxy-3-(3-methyl-5-oxo-1-phenyl-2-pyrazolin-4-ylazo)-5-nitrobenzenesulfonic acid

3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxy-5-nitrobenzenesulphonic acid