lactone rule

例句：

1. 1. The lactone rule is a crucial concept in the study of organic chemistry.
   缩合规则是有机化学研究中至关重要的概念。
2. 2. In the lactone rule, the carbonyl group is attached to the aromatic ring through a single bond.
   在缩合规则中，羰基通过单键连接到芳香环上。
3. 3.The lactone rule is used to predict the reactivity of compounds containing lactones.
   缩合规则用于预测含有内酯化合物的反应性。