杂环的

例句：

1. 1. The compound has a complex structure, which makes it difficult to synthesize.
   这种化合物结构复杂，难以合成。
2. 2. The researcher analyzed the structure of the compound to understand its properties.
   研究者分析了化合物的结构以了解其性质。
3. 3. The synthesis of this compound is a challenging task due to its unique molecular structure.
   由于其独特的分子结构，合成这种化合物是一项具有挑战性的任务。