1H-Pyrazole-3-carboxylic acid, 4-((2,5-dimethoxy-4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-4,5-dihydro-5-oxo-1-(4-sulfophenyl)- 26424-23-7 29092-63-5 4-((4-((2-Hydroxyethyl)sulphonyl)-2,5-dimethoxyphenyl)azo)-5-oxo-1-(p-sulphophenyl)-2-pyrazoline-3-carboxylic acid, hydrogen sulphate (ester) EINECS 249-425-5