Sildenafil
Sildenafil
5-[2-Ethoxy-5-(4-methylpiperazin-1-yl-sulphonyl)phenyl]-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazol[4,3d]pyrimidin-7-one
Molecular Formula C22H30N6O4S
Molecular Weight 474.58
CAS Registry Number 139755-83-2