mixed anhydride

例句：

1. 1. The compound was synthesized using a mixture of acids and anhydrides.
   该化合物是通过使用酸和酸酐的混合物合成的。
2. 2. The process involves the reaction of two different acids with anhydrides to produce a new compound.
   这个过程涉及两种不同酸与酸酐的反应，以产生一种新的化合物。
3. 3. The use of mixed anhydrides in polymer synthesis has increased in recent years due to their superior thermal stability.
   由于其优异的热稳定性，近年来在聚合物合成中使用混合酸酐的数量有所增加。