trisodium 4-[[4-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-2-sulphonatophenyl]azo]-4,5-dihydro-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate

4-[[4-[(4,6-Dichloro-1,3,5-triazin-2-yl)amino]-2-(sodiosulfo)phenyl]azo]-4,5-dihydro-5-oxo-1-[4-(sodiosulfo)phenyl]-1H-pyrazole-3-carboxylic acid sodium salt