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In page Uric acid:
"Uric acid displays lactam–lactim tautomerism (also often described as keto–enol tautomerism[3]). Although the lactim form is expected to possess some degree of aromaticity, uric acid crystallizes in the lactam form,[4] with computational chemistry also indicating that tautomer to be the most stable.[5] Uric acid is a diprotic acid with pKa1 = 5.4 and pKa2 = 10.3,[6] thus at physiological pH, it predominately exists as the monoionic urate ion.
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