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

最后，还有由黄形成的罕见结石，同尿酸一样，是解的副产物。

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

黄氧化负责解为尿酸，所抑制这个，就可减少尿酸的生成。

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

从化学角度来看，咖啡因既可述为甲基黄，也可述为生物碱。

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

也有一些药物可帮助降低尿酸含量，包括黄氧化抑制剂，如别醇。

But it is a stimulant called trimethylxanthine.

但它是一种叫做三甲基黄的刺激物。

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，化学上称为1,3,7-三甲基黄，实际上在结构上与我们体内自然存在的腺苷子相似。