1,3,5-Naphthalenetrisulfonic acid, 7-((4-((2,6-dichloro-4-pyrimidinyl)amino)phenyl)azo)-, trisodium salt 71720-92-8 EINECS 275-919-5 Trisodium 7-((4-((2,6-dichloro-4-pyrimidinyl)amino)phenyl)azo)naphthalene-1,3,5-trisulphonate