4-((4'-((2,4-Dihydroxy-5-((4-sulphophenyl)azo)phenyl)azo)(1,1'-biphenyl)-4-yl)azo)-4,5-dihydro-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic acid, sodium salt 94199-53-8 EINECS 303-426-8