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4-[(4-amino-5-methoxy-o-tolyl)azo]-5-[(phenylsulphonyl)oxy]naphthalene-2,7-disulphonic acid, sodium salt Structure

4-[(4-amino-5-methoxy-o-tolyl)azo]-5-[(phenylsulphonyl)oxy]naphthalene-2,7-disulphonic acid, sodium salt