2-Hydroxy-5-[[4'-[[5-oxo-4,5-dihydro-3-methyl-1-(2-methyl-5-sodiosulfophenyl)-1H-pyrazol-4-yl]azo]-2,2'-dimethyl-1,1'-biphenyl-4-yl]azo]benzoic acid sodium saltHCID 178783203CAS 61702-41-8 · C32H25N6Na3O7S