65620-36-2

1H-Pyrazolo[3,4-b]pyridine-4-carboxylic acid,5-[[4-(diethylamino)-2,6-dimethylphenyl]methylene]-2-(2,5-disulfophenyl)-2,3,5,6-tetrahydro-3,6-dioxo-, 4-ethyl ester, disodium salt