PF-04447943产品是PF-04447943 is a potent, brain-penetrant and selective inhibitor of PDE9 (Phosphodiesterase 9) (Ki of 2.8, 4.5 and 18 nM for human, rhesus and rat recombinant PDE9 respectively). Displays high selectivity for PDE9 versus PDEs1-8 and 10-11.