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Cuprate(4-), .mu.-7,7-6-(2-hydroxyethyl)amino-1,3,5-triazine-2,4-diyldiiminobis4-(hydroxy-.kappa.O)-3-2-(hydroxy-.kappa.O)-5-sulfophenylazo-.kappa.N1-2-naphthalenesulfonato(8-)di-, tetrasodium related products: