Used in antiviral research, particularly in the development of nucleoside analogs that inhibit viral replication. Its structure allows integration into viral DNA or RNA, causing chain termination and preventing further replication. Commonly explored in studies targeting herpesviruses and other DNA viruses. Also serves as a key intermediate in synthesizing bioactive molecules due to its phosphonate and purine moieties, which enhance cellular uptake and metabolic stability. Investigated for potential use in prodrug formulations to improve pharmacokinetics in antiviral therapies.