bivalirudin acetate（128270-60-0 free base）

Bivalirudin (BG-8967) is a reversible inhibitor of α- and ζ-thrombin (Kis = 2.56 and 1.84 nM, respectively), enzymes that exhibit high fibrinogen-clotting activities.

Bivalirudin TFA, a synthetic 20-residue peptide, serves as a reversible inhibitor of thrombin. Its IC50 value highlights its target specificity in vitro, where, combined with Eptifibatide (8 mg/mL) at a low concentration (70 ng/mL), it significantly reduces platelet aggregation induced by thrombin (0.2 U/mL) by approximately 90% [1]. The compound demonstrates no effect on thrombin generation assay (TGA) parameters up to 10 μmol/L [2]. Additionally, it facilitates the binding of MPO to BAEC, leading to functional alterations such as increased NO consumption and enhanced MPO-mediated redox modifications [3]. In vivo studies reveal its efficacy in preventing the rise of antiheparin/PF4 antibody IgG levels in rats, with significant findings from the toxicokinetic assessment signaling its safety profile at tested doses, although higher doses resulted in fatalities [4][5]. In clinical trials, its antithrombotic effects were explored, comparing it with alternatives like Ticagrelor and Clopidogrel in a Phase 4 study.