1,3,6-Naphthalenetrisulfonic acid, 7-((6-((5-chloro-2,6-difluoro-4-pyrimidinyl)amino)-1-hydroxy-3-sulfo-2-naphthalenyl)azo)-, tetrasodium salt 71720-91-7 EINECS 275-917-4 Tetrasodium 7-((6-((5-chloro-2,6-difluoro-4-pyrimidinyl)amino)-1-hydroxy-3-sulphonato-2-naphthyl)azo)naphthalene-1,3,6-trisulphonate