1-(1,4-Dihydro-3-hydroxy-1,4-dioxo-2-naphthyl)pyridiniumhydroxide, inner salt (6CI,7CI); Pyridinium,1-(1,4-dihydro-3-hydroxy-1,4-dioxo-2-naphthyl)-, hydroxide, inner salt (8CI);EMD 18701
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