Synonyms: 2,7-Naphthalenedisulfonicacid, 3,6-bis[(2-arsonophenyl)azo]-4,5-dihydroxy- (9CI);2,7-Naphthalenedisulfonic acid, 3,6-bis[(o-arsonophenyl)azo]-4,5-dihydroxy-(8CI);Benzenearsonic acid,2,2'-(1,8-dihydroxy-3,6-disulfo-2,7-naphthylenebisazo)di- (6CI);2,7-Bis(2,2'-arsonophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid;2,7-Bis(2-arsonophenylazo)-1,8-dihydroxy-3,6-naphthalenedisulfonic acid;Arsenazo III;NSC 91528;