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2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-[[4'- [(1-hydroxy-4-sulfo-2-naphthalenyl)azo]-3,3'-dimethoxy [1,1'-biphenyl]-4-yl]azo]-, trisodium salt Structure

2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-[[4'- [(1-hydroxy-4-sulfo-2-naphthalenyl)azo]-3,3'-dimethoxy [1,1'-biphenyl]-4-yl]azo]-, trisodium salt