Sildenafil139755-83-2100 % similar Sildenafil citrate171599-83-078 % similar o-Desethyl sildenafil139755-91-277 % similar Aildenafil496835-35-976 % similar 5-(5-Chlorosulfonyl-2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one139756-22-272 % similar 5-(2-Ethoxyphenyl)-1-methyl-3-N-propyl-1,6-dihydro-7H-pyrazolo[4,3-D]-7-pyrimidinone139756-21-163 % similar Udenafil268203-93-660 % similar Acetildenafil831217-01-760 % similar Vardenafil dihydrochloride224789-15-555 % similar Vardenafil224785-90-449 % similar Pseudovardenafil224788-34-549 % similar Vardenafil hydrochloride224785-91-548 % similar Vardenafil hydrochloride trihydrate330808-88-346 % similar Mirodenafil862189-95-538 % similar 5-Ethyl-3,5-dihydro-2-[5-[[4-(2-hydroxyethyl)-1-piperazinyl]sulfonyl]-2-propoxyphenyl]-7-propyl-4H-pyrrolo[3,2-d]pyrimidin-4-one hydrochloride (1:2)862189-96-637 % similar 2-(2-Ethoxyphenyl)-5-methyl-7-propyl-3H-imidazo[5,1-f][1,2,4]triazin-4-one224789-21-333 % similar 4-(4-Methylpiperazine-1-sulfonyl)aniline21623-68-731 % similar