1-cyclopentyl-6-{(1R)-1-[3-(pyrimidin-2-yl)azetidin-1-yl]ethyl}-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one

O76083 — High affinity cGMP-specific 3',5'-cyclic phosphodiesterase 9A