67689-48-9 Dihydrogen (3-((4,5-dihydro-3-methyl-5-oxo-1-(4-((2-(sulphooxy)ethyl)sulphonyl)phenyl)-1H-pyrazol-4-yl)azo)-4-hydroxybenzenesulphonato(4-))cuprate(2-) EINECS 266-904-4