2-Naphthalenesulfonic acid, 1-(2-(2-hydroxy-1-naphthalenyl)diazenyl)-, barium salt (2:1);1-((2-Hydroxy-1-naphthalenyl)azo)-2-naphthalenesulfonic acid, barium salt (2:1);2-Naphthalenesulfonic acid, 1-((2-hydroxy-1-naphthalenyl)azo)-, barium salt (2:1);Barium 1-((2-hydroxy-1-naphthyl)azo)naphthalene-2-sulphonate(1:2);barium bis{1-[(2Z)-2-(2-oxonaphthalen-1(2H)-ylidene)hydrazinyl]naphthalene-2-sulfonate}
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