方法以胞嘧啶为起始原料，经六步反应合成西多福韦。
Methods Cidofovir was synthesized via 6-step reactions with cytosine as the starting material.
一种简单的含氮有机分子，具一个双环结构——六元嘧啶环融合成一个五元咪唑环。
Purine a simple nitrogenous organic molecule with a double-ring structure? A 6-membered pyrimidine ring fused to a 5-membered imidazole ring.
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