2,6-Diaminopurine is primarily used in biochemical research as a purine analog. It serves as a tool to study nucleic acid metabolism and enzyme mechanisms, particularly those involving purine biosynthesis and degradation. This compound is also employed in the development of antiviral and anticancer agents, as it can interfere with DNA and RNA synthesis in rapidly dividing cells. Additionally, it is utilized in the synthesis of modified nucleosides and nucleotides, which are essential in exploring genetic material and designing therapeutic molecules. Its ability to mimic natural purines makes it valuable in probing cellular processes and drug discovery.