Interaction of metal ions with alloxanthine, a model in xanthine oxidase inhibition by the drug allopurinol: synthesis and characterization of M(alloxanthine)2(NO3)2.cntdot.2H2O (M = copper, cobalt) and bis(alloxanthine)dichlorozinc

Metal complexes of the xanthine oxidase inhibiting molecule alloxanthine (pyrazolo[3,4-d]pyrimidine-2,6-dione) have been synthesized in form of single crystals from aqueous solutions by the reaction of alloxanthine with an excess of the respective metal salts