Barium 4,5-dihydro-5-oxo-1-(4-sulphonatophenyl)-4-((4-sulphonatophenyl)azo)-1H-pyrazole-3-carboxylate (3:2);$l2-barane; 5-oxo-1-(4-sulfonatophenyl)-4-(4-sulfonatophenyl)azo-4H-pyrazole-3-carboxylate
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