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6-[(2,4-Diaminophenyl)azo]-4-hydroxy-3-[[4-[(2,4-dihydroxyphenyl)azo]phenyl]azo]naphthalene-2-sulfonic acid sodium salt Structure

6-[(2,4-Diaminophenyl)azo]-4-hydroxy-3-[[4-[(2,4-dihydroxyphenyl)azo]phenyl]azo]naphthalene-2-sulfonic acid sodium salt