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1H-Pyrazole-3-carboxylic acid,4-[[2,5-bis[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, sodium salt

1H-Pyrazole-3-carboxylic acid,4-[[2,5-bis[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, sodium salt