Lopamidol is a commonly used contrast agent for diagnostic imaging procedures. However, during the manufacturing process of Lopamidol, impurities may be produced which can affect the safety and efficacy of the final product. These impurities can include various organic compounds, including aldehydes, ketones, and acids. It is important to monitor and control the levels of these impurities to ensure the quality and safety of Lopamidol for medical use.