Tyropanoic Acid and its Impurities

Tyropanoic acid (Trade names include Bilopaque, Lumopaque, Tyropaque, and Bilopac) and its salt sodium tyropanoate are radiocontrast agents used in cholecystography (X-ray diagnosis of gallstones). Reference standards of Tyropanoic Acid API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.