1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-4-((3-phosphonophenyl)azo)-1-(4-sulfophenyl)-, diammonium salt 4,5-Dihydro-5-oxo-4-((3-phosphonophenyl)azo)-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid, diammonium salt 70815-23-5