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

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