Synthesis and structure–activity relationship of new analogues of antistasin

Intensive investigation connected with the development of new anticoagulant agents for the treatment of cardiovascular diseases was carried out. Direct and specific inhibition of thrombin and Factor Xa-like serine proteases in the coagulation cascade has been the focus of many efforts to design novel anticoagulants over the past decade. This work reports the synthesis and biological activity of new anticoagulant peptide analogues of natural isoforms 2 and 3 of antistasin. In addition they include different tripeptide sequences in their molecules, which are highly active inhibitors of different serine proteases such as plasmin, trypsin, thrombin and Factor Xa.