Synonyms: Benzenesulfonic acid, 5-(2-(4,5-dihydro-3-methyl-5-oxo-1-(4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)-1H-pyrazol-4-yl)diazenyl)-2,4-dimethoxy-;5-((4,5-Dihydro-3-methyl-5-oxo-1-(4-((2-(sulphooxy)ethyl)sulphonyl)phenyl)-1H-pyrazol-4-yl)azo)-2,4-dimethoxybenzenesulphonic acid;Benzenesulfonic acid, 5-((4,5-dihydro-3-methyl-5-oxo-1-(4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)-1H-pyrazol-4-yl)azo)-2,4-dimethoxy-;2,4-dimethoxy-5-{(E)-[3-methyl-5-oxo-1-(3-{[2-(sulfooxy)ethyl]sulfonyl}phenyl)-4,5-dihydro-1H-pyrazol-4-yl]diazenyl}benzenesulfonic acid