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4-[[2,6-dihydroxy-3-[(4-nitrophenyl)azo]-5-[(6-sulpho-1-naphthyl)azo]phenyl]azo]naphthalene-1-sulphonic acid, sodium salt Structure

4-[[2,6-dihydroxy-3-[(4-nitrophenyl)azo]-5-[(6-sulpho-1-naphthyl)azo]phenyl]azo]naphthalene-1-sulphonic acid, sodium salt