4-[[5-[[4-(4-Butylphenoxy)-6-chloro-1,3,5-triazin-2-yl]amino]-2-sulfophenyl]azo]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid

4-[[5-[[4-(4-butylphenoxy)-6-chloro-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-4,5-dihydro-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic acid