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  Indian J Med Microbiol
 

Figure 8: 500 MHz 1D 1H nuclear magnetic resonance spectrum of sildenafil (a), acetylsalicylic acid (b), fumaric acid (c), and benzoic acid (d)

Figure 8: 500 MHz 1D 1H nuclear magnetic resonance spectrum of sildenafil (a), acetylsalicylic acid (b), fumaric acid (c), and benzoic acid (d)