英文别名N-(2-(Dimethylamino)ethyl)-4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonamide; Sildenafil Impurity 299; Sildenafil-descarbon; Sildenafil Descarbon Impurity; Sildenafil Related Compound 3; 3-(6,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-N-[2-(dimethylamino)ethyl]-4-ethoxybenzenesulfonamide