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trisodium 4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-[(3-sulphonatophenyl)azo]naphthalene-2,7-disulphonate Structure

trisodium 4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-[(3-sulphonatophenyl)azo]naphthalene-2,7-disulphonate