(3-Hydroxy-4-((1-sulpho-2-naphthyl)azo)-2-naphthoato(2-))manganese;manganese(2+) (4Z)-3-oxo-4-[2-(1-sulfonatonaphthalen-2-yl)hydrazinylidene]-3,4-dihydronaphthalene-2-carboxylate
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