5-Chloro-7-methyl-螖 4,9-isouric acid ( 11) has been chemically synthesized and shown to be rapidly converted to 5-hydroxy-7-methyl-螖 4,9-isouric acid ( 14) in aqueous buffers at ca. pH 7. The physical and chemical properties of 14 in solution have been elucidated. Electrochemical...