Finally, there are some rare stones made of xanthine, which, just like uric acid, is a byproduct of purine breakdown.

最后，还有由黄嘌呤形成的罕见结石，同尿，是嘌呤分解的副产物。

Xanthine oxidase is an enzyme involved in the breakdown of purines to uric acid, so inhibiting this enzyme results in less uric acid production.

黄嘌呤氧化负责分解嘌呤尿，所以抑制这个，就可以减少尿的生成。

Now, from a chemical perspective, caffeine can be described as both a methylxanthine and an alkaloid.

从化学角度来看，咖啡因既可以被描述黄嘌呤，也可以被描述生物碱。

There are also medications that help to decrease uric acid levels, which include xanthine oxidase inhibitors like allopurinol.

也有些药物可以帮助降低尿含量，包括黄嘌呤氧化抑制剂，如别嘌醇。

But it is a stimulant called trimethylxanthine.

但它是种叫做三黄嘌呤的刺激物。

Caffeine, known to chemists as 1,3,7-trimethylxanthine, is actually similar in structure to naturally-occurring molecules in our in our body called adenosines.

咖啡因，化学上称1,3,7-三黄嘌呤，实际上在结构上与我们体内自然存在的腺苷分子相似。