海生丁(黃嘌呤)抑制劑2,6-Dihydroxypurine is a purine base found in most body fluids and tissues, certain urinary calculi, and some plants. 2,6-Dihydroxypurine, formed by oxidation of hypoxanthine, is an intermediate in the degradation of adenosine monophosphate to uric acid. The methylated xanthine compounds theobromine, caffeine, and theophylline and their derivatives are used in medicine for their bronchodilator effects.