6-Methyl-2-(4-((3-methyl-5-oxo-2-pyrazolin-4-yl)azo)phenyl)-7-benzothiazolesulfonic acid 68568-78-5 7-Benzothiazolesulfonic acid, 2-(4-((4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)phenyl)-6-methyl- 75476-92-5