Synonyms: 2,7-Naphthalenedisulfonicacid,5-(acetylamino)-4-hydroxy-3-[[4-methoxy-3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-,trisodium salt (9CI); 2,7-Naphthalenedisulfonic acid,5-acetamido-4-hydroxy-3-[[3-[(2-hydroxyethyl)sulfonyl]-4-methoxyphenyl]azo]-,3-(hydrogen sulfate), trisodium salt (8CI)