xanthine
/ˈzænθiːn/noun
mass noun
1- Biochemistry a crystalline compound found in blood and urine which is an intermediate in the metabolic breakdown of nucleic acids to uric acid【生化】黄嘌呤。
1.1
- A purine derivative; chem. formula: C5H4N4O2.嘌呤衍生物; 化学分子式C5H4N4O2.
1.2
- count noun any of the derivatives of this, including caffeine and related alkaloids.黄嘌呤衍生物（如咖啡因和相关生物碱）。
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