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

O76074 — cGMP-specific 3',5'-cyclic phosphodiesterase