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Benzenesulfonic acid,4-[5-[5-[3,7-dihydro-6-hydroxy-4,7-dimethyl-3-oxo-2-(4-sulfophenyl)-2H-pyrazolo[3,4-b]pyridin-5-yl]-2,4-pentadienylidene]-3,5,6,7-tetrahydro-4,7-dimethyl-3,6-dioxo-2H-pyrazolo[3,4 related products: