Selective inhibitor of type III phosphodiesterase (PDE3). Displays moderate selectivity for PDE3A isozyme vs. PDE3B (IC50 values are 0.027 and 0.050 μM for PDE3A and PDE3B respectively). Inhibits ADP-induced platelet aggregation (IC50 = 16.8 μM); anti-thrombotic. Also available as part of the Phosphodiesterase Inhibitor Tocriset™.