5-[2-(but-3-en-1-yloxy)-5-(1-hydroxyvinyl)pyridin-3-yl]-3-ethyl-2-(1-ethylazetidin-3-yl)-1,2,6,7a-tetrahydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
5-[2-(but-3-en-1-yloxy)-5-(1-hydroxyvinyl)pyridin-3-yl]-3-ethyl-2-(1-ethylazetidin-3-yl)-1,2,6,7a-tetrahydro-7h-pyrazolo[4,3-d]pyrimidin-7-one