Synonyms: 21493-04-9;sodium 6-methyl-2-{4-[(e)-(3-methyl-5-oxo-4,5-dihydro-1h-pyrazol-4-yl)diazenyl]phenyl}-1,3-benzothiazole-7-sulfonate;AC1Q1W12;AR-1L4988;6-Methyl-2-(p-((3-methyl-5-oxo-2-pyrazolin-4-yl)azo)phenyl)-7-benzothiazolesulfonic acid, sodium salt;7-Benzothiazolesulfonic acid, 2-(4-((4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)phenyl)-6-methyl-, monosodium salt;7-Benzothiazolesulfonic acid, 2-(4-(2-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)diazenyl)phenyl)-6-methyl-, sodium salt (1:1);7-Benzothiazolesulfonic acid, 2-[4-[(4,5-dihydro-3-methyl- 5-oxo-1H-pyrazol-4-yl)azo]phenyl]-6-methyl-, monosodium salt