英文别名4-Ethoxy-3-(5-methyl-4-oxo-7-propyl-1,4-dihydroimidazo[5,1-f][1,2,4]triazin-2-yl)benzenesulfonic acid; Vardenafil EP Impurity B; Vardenafil Impurity 2(Vardenafil EP Impurity B); Vardenafil EP Imp B; Benzenesulfonic acid, 3-(1,4-dihydro-5-methyl-4-oxo-7-propylimidazo[5,1-f][1,2,4]triazin-2-yl)-4-ethoxy-; Vardenafil Sulfonic Acid Impurity; Vardenafil hydrochloride EP impurity B