CAS No 101899-41-6 , 1H-Pyrazole-3-carboxylicacid,4-[3-[3-carboxy-1-(2,5-disulfophenyl)-1,5-dihydro-5-oxo-4H-pyrazol-4-ylidene]-1-propen-1-yl]-1-(2,5-disulfophenyl)-4,5-dihydro-5-oxo-,potassium salt (1:4)

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