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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