C.I.19135

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1H-Pyrazole-3-carboxylic acid,4,5-dihydro-5-oxo-1-(4-sulfophenyl)-4-[(2-sulfophenyl)azo]-,trisodium salt

5-Oxo-4,5-dihydro-1-(4-sodiosulfophenyl)-4-[(2-sodiosulfophenyl)azo]-1H-pyrazole-3-carboxylic acid sodium salt