名詞 xanthine:

1. crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine

xan.thine

n.（名詞）
A yellowish-white, crystalline purine base, C5H 4N 4O 2, that is a precursor of uric acid and is found in blood, urine, muscle tissue, and certain plants.
黃嘌呤：一種黃白色結(jié)晶的嘌呤鹼，C5H 4N 4O 2，它是尿酸的前身，常見于血液、尿液、肌肉組織和某些植物中
Any of several derivatives of this compound.
此類化合物的各種衍生物