1,3-Naphthalenedisulfonicacid, 7-hydroxy-8-[[4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]- (9CI);1,3-Naphthalenedisulfonic acid,7-hydroxy-8-[[4'-[(p-hydroxyphenyl)azo]-4-biphenylyl]azo]- (8CI);7-Hydroxy-8-[[4'-[(p-hydroxyphenyl)azo]-4-biphenylyl]azo]-1,3-naphthalenedisulfonicacid
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