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4-Hydroxy-3-[[4'-[[4-[(1-hydroxy-4-sodiosulfo-2-naphthalenyl)azo]-1-naphthalenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]naphthalene-1-sulfonic acid sodium salt Structure

4-Hydroxy-3-[[4'-[[4-[(1-hydroxy-4-sodiosulfo-2-naphthalenyl)azo]-1-naphthalenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]naphthalene-1-sulfonic acid sodium salt