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3,3'-[(2,2'-Disulfo[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[6-hydroxy-4-methylbenzoic acid]tetrasodium salt Structure

3,3'-[(2,2'-Disulfo[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[6-hydroxy-4-methylbenzoic acid]tetrasodium salt