4H-Pyrazolo(3,4-d)pyrimidin-4-one, 1,5-dihydro-6-((3S,4S)-4-methyl-1-(2-pyrimidinylmethyl)-3-pyrrolidinyl)-1-(tetrahydro-2H-pyran-4-yl)-
PF-04447943 has been investigated for the treatment of Alzheimer's Disease.