英文别名Vardenafil Impurity 19; N-{1-[3-(2-ethoxyphenyl)-5-oxo-4,5-dihydro-[1,2,4]triazin-6-yl]ethyl}butyroamide; N-(1-(3-(2-ethoxyphenyl)-4,5-dihydro-5-oxo-1,2,4-triazin-6-yl)ethyl)butanamide; N-{1-[3-(2-ethoxyphenyl)-4,5-dihydro-5-oxo-1,2,4-triazin-6-yl]ethyl}butyramide; Vardenafil Impurity 5; Vardefil Impurity 5; Vardenafil Impurity 21; Butanamide, N-[1-[3-(2-ethoxyphenyl)-2,5-dihydro-5-oxo-1,2,4-triazin-6-yl]ethyl]-; N-(1-(3-(2-Ethoxyphenyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl)ethyl)butyramide 
