2-Naphthalenesulfonic acid, 5(or 8)-amino-8(or 5)-(2-phenyldiazenyl)-, sodium salt (1:1);4-(Phenylazo)-1-amino-6(or 7)-naphthalenesulfonic acid, sodium salt;2-Naphthalenesulfonic acid, 5(or 8)-amino-8(or 5)-(phenylazo)-, monosodium salt;Sodium (5or8)-amino-(8or5)-(phenylazo)naphthalene-2-sulphonate
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