122113-52-4 5H-Pyrrolo(3,4-d)pyrimidin-5-one, 6,7-dihydro-6-methyl-2-(1-piperidinyl)- 6-methyl-2-(1-piperidinyl)-6,7-Dihydro-5H-pyrrolo(3,4-d)pyrimidin-5-one