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copper(2+) sodium 5-{3-carboxylato-4-[(2E)-2-{3-[(E)-(2,4-disulfonatophenyl)diazenyl]-4-hydroxy-6-oxocyclohexa-2,4-dien-1-ylidene}hydrazinyl]benzyl}-2-[(2Z)-2-{3-[(E)-(2,4-disulfonatophenyl)diazenyl]- related products: