Figure (Allopurinol Fig 1)
This is a chemical structure diagram showing the conversion of hypoxanthine to xanthine to uric acid through various compounds, including allopurinol and osipurinol. The text also includes the chemical names for these compounds in addition to 1,5-dihydro-4H-pyrazolo- 1Hpyrazolo [34-d][3.4-d]pyrimidin-3-one and various derivatives of purine.*