2-Naphthalenesulfonic acid, 4-hydroxy-3-((4-(2-(sulfooxy)ethoxy)phenyl)azo)-7-((2,5,6-trichloro-4-pyrimidinyl)amino)-, disodium salt 71701-31-0 Disodium 4-hydroxy-3-((4-(2-(sulphonatooxy)ethoxy)phenyl)azo)-7-((2,5,6-trichloro-4-pyrimidinyl)amino)naphthalene-2-sulphonate EINECS 275-873-6