5-(N-dhp-acetamido)-2,4,6-triiodo-N,N'-B is-dhp-isophthalami is a raw material for contrast agents, which are usually injected intravenously before CT imaging diagnosis and used for angiography, urinary system, spinal cord and femoral joint, and lymphatic system imaging. It has the advantages of low contrast density, low toxicity, and good tolerance, and is currently one of the best contrast agents. Developed countries have completely replaced ionic contrast agents with it and it is also a diagnostic drug.