1-methyl-3-propyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-d]pyrimidin-5,7-dione

1-methyl-5-(methyl((5-phenylisoxazol-3-yl)methyl)amino)-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one

5-chloro-1-methyl-3-propyl-1,6-dihydro-pyrazolo[4,3-d]pyrimidin-7-one

1-methyl-5-((5-methyl-2-phenyl-2H-1,2,3-triazol-4-yl)methylamino)-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one

5-(4-(2,2-diphenylacetoyl)piperazin-1-yl)-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one

5-(4-(2-chloro-6-fluorobenzyl)-1,4-diazepan-1-yl)-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one

5-((1H-1,2,4-triazol-1-yl)benzyl)(2-methylbutyl)amino-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one