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4,5-Dihydroxy-3-[4-[(2-hydroxy-1-naphthalenyl)azo]phenylazo]naphthalene-2,7-disulfonic acid disodium salt Structure

4,5-Dihydroxy-3-[4-[(2-hydroxy-1-naphthalenyl)azo]phenylazo]naphthalene-2,7-disulfonic acid disodium salt