1-((2-Carboxyphenyl)azo)-2-hydroxynaphthalene, barium salt (2:1) 1325-01-5 6372-81-2 Barium bis(2-((2-hydroxy-1-naphthyl)azo)benzoate) Benzoic acid, 2-((2-hydroxy-1-naphthalenyl)azo)-, barium salt (2:1) EINECS 228-906-3