4,4'-Bis[3-carboxy-5-oxo-1-(4-sulfophenyl)-2-pyrazolin-4-yl]pentamethine oxonole dipotassium salt

for the following products 1,1'-bis-(4-Sulfophenyl)-3,3'-dicarboxy-5,5'-dihydroxypyrazolo-4,4'-pentamethineoxonole dipotassium salt | Oxonole blue dipotassium salt and 4,4'-Bis[3-carboxy-5-oxo-1-(4-sulfophenyl)-2-pyrazolin-4-yl]pentamethine oxonole dipotassium salt