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