25828-75-5 EINECS 247-288-6 Trihydrogen (4,5-dihydro-4-((2-hydroxy-4-((2-(sulphooxy)ethyl)sulphonyl)phenyl)azo)-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylato(5-))cuprate(3-)