这个词是什么意思？
A family of 6-membered heterocyclic compounds occurring in nature in a wide variety of forms. They include several nucleic acid constituents (CYTOSINE; THYMINE; and URACIL) and form the basic structure of the barbiturates.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D011743 · MeSH 2026。
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