(E)-3-(2-(4-((2-carboxyethyl)carbamoyl)-2-((E)-(4-((2-carboxyethyl)carbamoyl)phenyl)diazenyl)phenyl)hydrazono)-6-oxocyclohexa-1,4-dienecarboxylic acid; 5-[(1E)-2-[2-[(1E)-2-[4-[[(2-carboxyethyl)amino]carbonyl]phenyl]diazenyl]-4-[[(2-carboxyethyl)amino]carbonyl]phenyl]diazenyl]-2-hydroxybenzoic Acid; (E,E)-5-[[2-[4-(2-Carboxyethylcarbamoyl)phenylazo]-4-(2-carboxyethylcarbamoyl)]phenylazo]salicylic Acid; Balsalazide USP Impurity 3