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copper(2+) sodium 4-[(2E)-2-{6-[({(6E)-6-[2-(2,8-dioxido-3,6-disulfonatonaphthalen-1-yl)hydrazinylidene]-5-oxo-4,8-disulfonato-5,6-dihydronaphthalen-2-yl}carbamoyl)amino]-1-oxo-4,8-disulfonatonaphthal related products: