5-[[4-chloro-6-[[4-(vinylsulphonyl)phenyl]amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(2-sulphophenyl)azo]naphthalene-2,7-disulphonic acid, sodium salt

5-[[4-Chloro-6-[[4-(ethenylsulfonyl)phenyl]amino]-1,3,5-triazine-2-yl]amino]-4-hydroxy 3-[(2-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid/sodium,(1:x) salt