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4,5-Dihydroxy-3-[(2-hydroxy-5-methyl-4-nitrophenyl)azo]naphthalene-2,7-disulfonic acid disodium salt Structure

4,5-Dihydroxy-3-[(2-hydroxy-5-methyl-4-nitrophenyl)azo]naphthalene-2,7-disulfonic acid disodium salt