1357931-55-5

Sildenafil D Sildenafil impurity D Sildenafil EP IMpurity D Methisosildenafil Impurity 19 Sildenafil Impurity 4(Sildenafil EP Impurity D) 4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[ 4-ethoxy-3-(1-methyl-7-oxo-3-propyl-4H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid 3-(6,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxybenzenesulfonic acid 4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid Benzenesulfonic acid, 3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxy- Sildenafil Impurity 4/Sildenafil EP Impurity D/ Demethylpiperazinyl Sildenafil Sulfonic Acid/4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid Imp. D (Pharmeuropa): 4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1Hpyrazolo[4,3-d]-pyrimidin-5-yl)benzenesulfonic Acid(3-(4,7-Dihydro-1-methyl-7-oxo-3-propyl-1Hpyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxybenzenesulfonicAcid)