6-Chloropurine ribonucleoside is primarily used in biochemical research as a precursor in the synthesis of various nucleoside analogs. These analogs are crucial in the study of nucleic acid metabolism and the development of antiviral and anticancer agents. It serves as an intermediate in the production of modified nucleosides that can inhibit the replication of viruses or the proliferation of cancer cells by interfering with DNA or RNA synthesis. Additionally, it is utilized in enzymatic studies to understand the mechanisms of nucleoside phosphorylases and other related enzymes, which play a significant role in cellular processes. Its application extends to the exploration of gene expression regulation and the design of therapeutic molecules targeting specific genetic pathways.