Synonyms: Amines, rosin, 4-(2-(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)diazenyl)-4'-(2-(2-hydroxy-1-naphthalenyl)diazenyl)(1,1'-biphenyl)-2,2'-disulfonate;Amines, rosin, 4-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-4'-((2-hydroxy-1-naphthalenyl)azo)(1,1'-biphenyl)-2,2'-disulfonate