This chemical is primarily used in immuno-oncology research, particularly in the development and testing of novel checkpoint inhibitors. It serves as a reagent for selectively targeting the PD-1 pathway in human immune cell assays, enabling the study of T-cell activation and immune evasion mechanisms in cancer. Its aldehyde-functionalized structure allows for site-specific conjugation to carrier proteins or solid supports, making it valuable in immunoassay design, antibody screening, and biosensor applications. It is also employed in pharmacokinetic and binding affinity studies during the early stages of therapeutic antibody development.