Salicylazoiminopyridine

Sulfasalazine IMpurity C

2-Hydroxy-5-[[4-(2-iMino-1(2H)-pyridinyl)phenyl]azo]benzoic Acid

2-Hydroxy-5-[2-[4-(2-iMino-1(2H)-pyridinyl)phenyl]diazenyl]benzoic Acid