Sildenafil Impurity 4
                    Catalogue Number:
                    S0152040
                
                
                    CAS#:
                    92534-69-5
                
                
                    Molecular Formula:
                    C5H5N3O4
                
                
                    Molecular Weight:
                    171.11
                
                
                    Synonyms:
                    1-methyl-4-nitro-1H-pyrazole-5-carboxylic acid
                
            
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