Sildenafil citrate salt

Methanol (test Sildenafil, 1.0 mg/mL）

5-[2-ethoxy-5-(4-Methylpiperazine-1-sulfonyl)phenyl]-1-Methyl-3-propyl-1H,6H,7H-pyrazolo[4,3-d]pyriMidin-7-one

5-(2-ETHOXY-5-(4-METHYLPIPERAZIN-1-YLSULFONYL)PHENYL)-1-METHYL-3-PROPYL-1H-PYRAZOLO[4,3-D]PYRIMIDIN-7(6H)-ONE CITRATE