Phthalylsulfathiazole and its Impurities

Phthalylsulfathiazole is a broad spectrum antimicrobial agent. It is used in the treatment of dysentery, colitis, and gastroenteritis and intestinal surgery. Reference standards of Phthalylsulfathiazole API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.