7-[[2-[(aminocarbonyl)amino]-4-[[4-[[5-[(4-amino-9,10-dihydro-9,10-dioxo-3-sulpho-1-anthryl)amino]-2-sulphophenyl]amino]-6-chloro-1,3,5-triazin-2-yl]amino]phenyl]azo]naphthalene-1,3,6-trisulphonic acid