Synonyms: 1,5-Naphthalenedisulfonicacid,3-[4-[[5-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]-2-sulfophenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-,trisodium salt (9CI); 1,5-Naphthalenedisulfonic acid, 3-[4-[[5-[(4-amino-6-chloro-s-triazin-2-yl)amino]-2-sulfophenyl]azo]-3-methyl-5-oxo-2-pyrazolin-1-yl]-,trisodium salt (7CI)