7-[(4,6-Dichloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-[(3-sulfophenyl)azo]-2-naphthalenesulfonic acid

7-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-[(3-sulphophenyl)azo]naphthalene-2-sulphonic acid