2,7-Naphthalenedisulfonic acid, 5-((3-((5-chloro-2,6-difluoro-4-pyrimidinyl)amino)benzoyl)amino)-3-((2,5-disulfophenyl)azo)-4-hydroxy-, tetrasodium salt 72139-13-0 EINECS 276-369-9 Tetrasodium 5-((3-((5-chloro-2,6-difluoropyrimidin-4-yl)amino)benzoyl)amino)-3-((2,5-disulphonatophenyl)azo)-4-hydroxynaphthalene-2,7-disulphonate