Synonyms: 1,3-Naphthalenedisulfonicacid,7-hydroxy-8-[[4'-[(4-hydroxyphenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-(9CI); 1,3-Naphthalenedisulfonic acid,7-hydroxy-8-[[4'-[(p-hydroxyphenyl)azo]-3,3'-dimethyl-4-biphenylyl]azo]- (8CI);7-Hydroxy-8-[[4'-[(p-hydroxyphenyl)azo]-3,3'-dimethyl-4-biphenylyl]azo]-1,3-naphthalenedisulfonicacid (8CI);1-[4'-(p-Hydroxyphenylazo)-3,3'-dimethyl-4-biphenylylazo]-2-hydroxynaphthalene-6,8-disulfonicacid