cytosine ring

• 胞嘧啶环

cytosine ring的用法和样例：

例句

1. Functionalized tetrahydropyridine and piperidine ring systems are widely found in biologically active natural products and pharmaceuticals.
   四氢吡啶和哌啶环结构是那些有生物活性和药用价值的天然产物中最常见的结构之一。