Synonyms: 4-((5-((4,6-Dichloro-1,3,5-triazin-2-yl)amino)-2-sulphophenyl)azo)-4,5-dihydro-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic acid;4-[(E)-{5-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-2-sulfophenyl}diazenyl]-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylic acid