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Title: Hutson, P. H, et al. The selective phosphodiesterase 9 (PDE9) inhibitor PF-04447943 (6-[(3S,4S)-4-methyl-1-(pyrimidin-2-ylmethyl)pyrrolidin-3-yl-1-(tetrahydro-2H-pyran-4-yl)-1,5-dihydro-4H-pyrazolo,4-dpyrimidin-4-one) enhances synaptic plasticity and