7-[[2-[(aminocarbonyl)amino]-4-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]phenyl]azo]naphthalene-1,3,6-trisulphonic, acid sodium salt

7-[[2-[(Aminocarbonyl)amino]-4-[(4-amino-6-chloro-1,3,5-triazine-2-yl)amino]phenyl]azo]-1,3,6-naphthalenetrisulfonic acid/sodium,(1:x) salt