| | Identification | Back Directory |  | [Name] 
 DESMETHYL SILDENAFIL
 |  | [CAS] 
 139755-82-1
 |  | [Synonyms] 
 UK 103320
 DESMETHYL SILDENAFIL
 Sildenafil N-desmethyl
 Sildenafil N-desmethy impurity
 Sildenafil N-DesMethyl  IMpurity
 Sildenafil N-DesMethyl Metabolite
 5-(2-Ethoxy-5-(piperazin-1-ylsulfonyl)phenyl)-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one
 5-[2-Ethoxy-5-(1-piperazinylsulfonyl)phenyl]-1,6-dihydro-1-methyl-3-propyl- 7H-pyrazolo[4,3-d]pyrimidin-7-one
 |  | [Molecular Formula] 
 C21H28N6O4S
 |  | [MDL Number] 
 MFCD00908398
 |  | [MOL File] 
 139755-82-1.mol
 |  | [Molecular Weight] 
 460.55
 | 
 | Chemical Properties | Back Directory |  | [Appearance] 
 White Solid
 |  | [Melting point ] 
 158-160°C
 |  | [density ] 
 1.44±0.1 g/cm3(Predicted)
 |  | [storage temp. ] 
 -20°C Freezer
 |  | [solubility ] 
 DMF: 5 mg/ml; DMSO: 10 mg/ml; DMSO:PBS (pH 7.2)(1:5): 0.15 mg/ml
 |  | [form ] 
 A crystalline solid
 |  | [pka] 
 10.05±0.20(Predicted)
 |  | [color ] 
 White to off-white
 |  | [Stability:] 
 Moisture Sensitive
 | 
 | Hazard Information | Back Directory |  | [Chemical Properties] 
 White Solid
 |  | [Uses] 
 A metabolite of Sildenafil, an orally active selective type 5 cGMP phosphodiesterase inhibitor
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