laevo isomer

例句：

1. 1. The structure of the 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 research team focused on finding the laevo isomer, which had not been discovered before.
   研究小组专注于寻找这个尚未被发现的左旋异构体。