tetrasodium 5-[[4-chloro-6-[(4-sulphonatophenyl)amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(1-sulphonato-2-naphthyl)azo]naphthalene-2,7-disulphonate

5-[[4-Chloro-6-[[4-[(sodiooxy)sulfonyl]phenyl]amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[1-[(sodiooxy)sulfonyl]-2-naphtyl]azo]-2,7-naphthalenedisulfonic acid disodium salt