12220-30-3 2-Naphthalenesulfonic acid, 6-amino-5-((5-chloro-2-((4-methylphenyl)sulfonyl)phenyl)azo)-4-hydroxy-, monosodium salt 6-Amino-5-((5-chloro-2-((4-methylphenyl)sulfonyl)phenyl)azo)-4-hydroxy-2-naphthalenesulfonic acid monosodium salt