6-Iodouridine is a halogenated nucleoside analog where an iodine atom is substituted at the 6-position of the uracil base. It is a derivative of uridine, a key component of RNA. This modification imparts unique chemical and biological properties, making it a valuable tool in biochemical research. The primary application of 6-iodouridine is in life science research as a versatile biochemical probe and a precursor for further chemical modifications. It serves as a crucial intermediate in the synthesis of other modified nucleosides and nucleotides, which are essential for studying nucleic acid structure, function, and metabolism. Its iodine atom provides a reactive handle for cross-coupling reactions (e.g., Sonogashira coupling) to introduce various functional groups, enabling the creation of fluorescently labeled or biotinylated nucleosides for diagnostic and probe development. It is also investigated for its potential antiviral and anticancer activities due to its ability to be incorporated into nucleic acids and disrupt normal cellular processes. As a halogenated heterocyclic compound, it also finds use as a specialized building block in medicinal chemistry for the synthesis of more complex nucleoside-based drug candidates. It is typically handled as a research chemical under standard laboratory safety protocols.