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Aildenafil496835-35-9100 % similar Sildenafil139755-83-276 % similar 5-(5-Chlorosulfonyl-2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one139756-22-269 % similar Sildenafil citrate171599-83-061 % similar 5-(2-Ethoxyphenyl)-1-methyl-3-N-propyl-1,6-dihydro-7H-pyrazolo[4,3-D]-7-pyrimidinone139756-21-161 % similar o-Desethyl sildenafil139755-91-258 % similar Udenafil268203-93-658 % similar Acetildenafil831217-01-756 % similar Vardenafil dihydrochloride224789-15-548 % similar Pseudovardenafil224788-34-545 % similar Vardenafil224785-90-443 % similar Vardenafil hydrochloride224785-91-542 % similar Vardenafil hydrochloride trihydrate330808-88-341 % similar Mirodenafil862189-95-533 % similar 2-(2-Ethoxyphenyl)-5-methyl-7-propyl-3H-imidazo[5,1-f][1,2,4]triazin-4-one224789-21-332 % 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)862189-96-632 % similar