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1-[(2-hydroxynaphthyl)methyl]-2-naphthyl 6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonate  Structure

1-[(2-hydroxynaphthyl)methyl]-2-naphthyl 6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonate