嘧啶是一种类似于吡啶的芳香杂环有机化合物.三种二嗪中的一种（六元杂环,环中有两个氮原子）,在环中位置1和3有氮原子.其他二嗪是吡嗪（1和4位的氮原子）和哒嗪（1和2位的氮原子）.在核酸中,三种核碱基是嘧啶衍生物：胞嘧啶（C）、胸腺嘧啶（T）和尿嘧啶（U）.
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