Trisodium 5-oxido-4-[(e)-2-(4-sulfonatophenyl)diazen-1-yl]-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylate
trisodium 5-oxido-4-[(e)-2-(4-sulfonatophenyl)diazen-1-yl]-1-(4-sulfophenyl)-1h-pyrazole-3-carboxylate