2,7-Naphthalenedisulfonic acid, 4-amino-3-((4-((5-chloro-2,6-difluoro-4-pyrimidinyl)amino)phenyl)azo)-6-((2,5-disulfophenyl)azo)-5-hydroxy-, tetrasodium salt 4-Amino-3-((4-((5-chloro-2,4-difluoropyrimidin-6-yl)amino)phenyl)azo)-5-hydroxy-6-((2,5-disulfophenyl)azo)-2,7-naphthalenedisulfonic acid, tetrasodium salt 75198-89-9