Hydrogen (3-hydroxy-4-((4-methyl-2-sulphophenyl)azo)naphthalene-2-carboxylato(3-))manganate(1-);manganese(2+) hydrogen 4-[(E)-(4-methyl-2-sulfonatophenyl)diazenyl]-3-oxidonaphthalene-2-carboxylate (1:1:1)
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