62121-75-9 Benzenesulfonic acid, 4-(4,5-dihydro-4-((2-methoxy-5-methyl-4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-3-methyl-5-oxo-1H-pyrazol-1-yl), sodium salt Benzenesulfonic acid, 4-(4,5-dihydro-4-((2-methoxy-5-methyl-4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-3-methyl-5-oxo-1H-pyrazol-1-yl)-, sodium salt EINECS 263-417-9 p-(4,5-Dihydro-4-((2-methoxy-5-methyl-4-((2-(sulphooxy)ethyl)sulphonyl)phenyl)azo)-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid, sodium salt