6-Chloro-7-iodo-7-deazapurine is primarily utilized in the field of medicinal chemistry and drug development. It serves as a key intermediate in the synthesis of various nucleoside analogs, which are crucial for the development of antiviral and anticancer agents. The compound's unique structure allows for modifications that can enhance the biological activity and selectivity of these therapeutic agents. Additionally, it is employed in biochemical research to study enzyme mechanisms and interactions, particularly those involving purine metabolism. Its halogenated structure makes it a valuable tool for probing the active sites of enzymes and understanding their catalytic processes.