Vardenafil IMpurity 1

Imidazo[5,1-f][1,2,4]triazine-7-carboxylic Acid, 2-(2-Ethoxyphenyl)-1,4-dihydro-5-methyl-4-oxo-, Ethyl Ester is a reagent in the preparation of imidazotriazinones which functions as substrates in the synthesis of phosphodiesterase 5 inhibitors.