tricyclal

例句：

1. 1. This compound is known for its unique tricyclic structure.
   这种化合物因其独特的三循环结构而闻名。
2. 2.The tricyclic molecule has a complex molecular structure.
   这个三循环分子具有复杂的分子结构。
3. 3. Tricyclic compounds are widely used in the pharmaceutical industry.
   三循环化合物在制药工业中广泛应用。