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5-(2-Ethoxyphenyl)-1-methyl-3-N-propyl-1,6-dihydro-7H-pyrazolo[4,3-D]-7-pyrimidinone139756-21-1100 % similar 5-(5-Chlorosulfonyl-2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one139756-22-270 % similar Sildenafil139755-83-263 % similar Acetildenafil831217-01-763 % similar Aildenafil496835-35-961 % similar Udenafil268203-93-651 % similar Sildenafil citrate171599-83-050 % similar o-Desethyl sildenafil139755-91-249 % similar 2-(2-Ethoxyphenyl)-5-methyl-7-propyl-3H-imidazo[5,1-f][1,2,4]triazin-4-one224789-21-348 % similar Vardenafil dihydrochloride224789-15-536 % similar 1,2-Diethoxybenzene2050-46-632 % similar Pseudovardenafil224788-34-532 % similar 1-(2-Bromoethoxy)-2-ethoxybenzene3259-03-831 % similar Vardenafil224785-90-431 % similar 1-Ethoxy-2-nitrobenzene610-67-330 % similar