50663-00-8 Disodium 2,5-dichloro-4-(4,5-dihydro-4-((2-methoxy-5-((2-(sulphonatooxy)ethyl)sulphonyl)phenyl)azo)-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonate EINECS 256-693-7