5-(5-Chlorosulfonyl-2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-D]pyrimidin-7-one139756-22-2100 % similar Sildenafil139755-83-272 % similar Aildenafil496835-35-969 % similar Acetildenafil831217-01-761 % similar Udenafil268203-93-659 % similar Sildenafil citrate171599-83-057 % similar o-Desethyl sildenafil139755-91-253 % similar Vardenafil dihydrochloride224789-15-544 % similar Pseudovardenafil224788-34-540 % similar Vardenafil224785-90-438 % similar Vardenafil hydrochloride224785-91-537 % similar Vardenafil hydrochloride trihydrate330808-88-336 % similar 2-(2-Ethoxyphenyl)-5-methyl-7-propyl-3H-imidazo[5,1-F][1,2,4]triazin-4-one224789-21-335 % similar 2,3-Dihydrobenzofuran-5-sulfonyl Chloride115010-11-234 % similar 4-Ethoxy-benzenesulfonyl chloride1132-17-834 % similar 4-Butoxybenzenesulfonyl chloride1138-56-332 % similar