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tetrasodium 5-{(2Z)-2-[1-oxo-6-(phenylamino)-3-sulfonatonaphthalen-2(1H)-ylidene]hydrazino}-8-[(E)-{6-sulfonato-4-[(E)-(3-sulfonatophenyl)diazenyl]naphthalen-1-yl}diazenyl]naphthalene-2-sulfonate related products: