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2,6-dioxypurine; purine base found in most body tissues and fluids, certain plants, and some urinary calculi; it is an intermediate in the degradation of adenosine monophosphate to uric acid, being formed by oxidation of hypoxanthine; methylated xanthine compounds caffeine, theobromine, and theophylline and their derivatives are used in medicine for their bronchodilator effects.
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