Vardenafil dihydrochloride224789-15-5100 % similar Vardenafil hydrochloride224785-91-573 % similar Vardenafil hydrochloride trihydrate330808-88-370 % similar Vardenafil224785-90-469 % similar Pseudovardenafil224788-34-558 % similar Sildenafil139755-83-255 % similar Aildenafil496835-35-948 % similar Sildenafil citrate171599-83-045 % similar Acetildenafil831217-01-745 % similar 5-(5-Chlorosulfonyl-2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-D]pyrimidin-7-one139756-22-244 % similar 2-(2-Ethoxyphenyl)-5-methyl-7-propyl-3H-imidazo[5,1-F][1,2,4]triazin-4-one224789-21-341 % 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)862189-96-641 % similar o-Desethyl sildenafil139755-91-241 % similar Mirodenafil862189-95-538 % similar Udenafil268203-93-638 % similar 5-(2-Ethoxyphenyl)-1-methyl-3-N-propyl-1,6-dihydro-7H-pyrazolo[4,3-D]-7-pyrimidinone139756-21-136 % similar