4,5-Dihydro-4-[[2-methoxy-5-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid tripotassium salt

tripotassium 4,5-dihydro-4-[[2-methoxy-5-[[2-(sulphonatooxy)ethyl]sulphonyl]phenyl]azo]-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate