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3-[[4-[(4-amino-7-sulpho-1-naphthyl)azo]-7-sulpho-1-naphthyl]azo]naphthalene-1,5-disulphonic acid, sodium salt Structure

3-[[4-[(4-amino-7-sulpho-1-naphthyl)azo]-7-sulpho-1-naphthyl]azo]naphthalene-1,5-disulphonic acid, sodium salt