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