Synonyms: 2,7-Naphthalenedisulfonicacid, 3,6-bis[(4-arsonophenyl)azo]-4,5-dihydroxy- (9CI);2,7-Naphthalenedisulfonic acid, 3,6-bis[(p-arsonophenyl)azo]-4,5-dihydroxy-(8CI); 2,7-Bis(p-arsonophenylazo)-1,8-dihydroxy-3,6-naphthalenedisulfonic acid;Paladiazo; Palladiazo; Palladiazo III; p-Arsenazo III