side chain isomer

例句：

1. 1. The structure of this compound is a key to its biological activity.
   这种化合物的结构是其生物活性的关键。
2. 2.The discovery of this new drug has revolutionized the treatment of cancer.
   这种新药的发现已经彻底改变了癌症的治疗方式。
3. 3.The study of side-chain isomerism is crucial for understanding the properties of polymers.
   研究侧链异构体对于理解聚合物的性质至关重要。