4,4'-[[1,1'-Biphenyl]-4,4'-diylbis(azo)]bis-1,2-benzenediol;4,4'-[[1,1'-Biphenyl]-4,4'-diylbis(azo)]bispyrocatechol;4,4'-Bis(pyrocatecholylazo)biphenyl;Benzidinebisazopyrocatechol
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