A serine proteases inhibitor that is capable of inhibiting trypsin (a digestive system protease; Ki = 15 nM), tryptase (a mast cell protease; Ki = 95.3 pM), and additional proteases in the coagulation cascade including thrombin (Ki = 0.84 μM); 300 mg/kg decreases the total number of eosinophils and lymphocytes in bronchoalveolar lavage fluid in a mouse model of allergic asthma.