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(4,5-Dihydroxy-3-[[4'-[[4-[(1,8-dihydroxy-4-sulfo-2-naphtyl)azo]-6-sulfo-1-naphtyl]azo]-3,3'-dimethyl-1,1'-biphenyl-4-yl]azo]-1-naphthalenesulfonic acid trisodium salt)

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