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4-amino-3-[(2,5-disulphophenyl)azo]-5-hydroxy-6-[(3-phosphonophenyl)azo]naphthalene-2,7-disulphonic acid, ammonium sodium salt  Structure

4-amino-3-[(2,5-disulphophenyl)azo]-5-hydroxy-6-[(3-phosphonophenyl)azo]naphthalene-2,7-disulphonic acid, ammonium sodium salt