501120-42-9

Sildenafil Impurity 6 Chlorosulfone 2-Methyl Isomer Sildenafil Chlorosulfone 2-Methyl Isomer DeMethylpiperazinyl Iso Sildenafil Sulfonyl Chloride 4-ethoxy-3-(2-methyl-7-oxo-3-propyl-4H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonyl chloride 3-(6,7-Dihydro-2-Methyl-7-oxo-3-propyl-2H-pyrazolo[4,3-d]pyriMidin-5-yl)-4-ethoxy-benzenesulfonyl Chloride Benzenesulfonyl chloride, 3-(6,7-dihydro-2-methyl-7-oxo-3-propyl-2H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxy-