Notes: 5-Iodouridine is a derivative of the pyrimidine nucleoside uridine (Item No. 20300). It inhibits dihydroorotase (Ki = 340 µM for the rat enzyme).{66662} 5-Iodouridine sensitizes Don Chinese hamster lung cells to irradiation in a concentration-dependent manner.{66663} It has been used in the synthesis of compounds with antiviral and anticancer activities.{66664}