Used primarily in biochemical research, S-2765 serves as a selective substrate for factor Xa (FXa) in enzymatic assays. It helps in studying and quantifying FXa activity, which is crucial for understanding blood coagulation pathways. Researchers utilize it to develop and test anticoagulant drugs, ensuring their efficacy and safety. Additionally, it aids in diagnosing coagulation disorders by measuring FXa levels in clinical samples. Its application extends to monitoring heparin therapy, where FXa inhibition is a key mechanism. This makes S-2765 a valuable tool in both laboratory research and medical diagnostics.