diastereomeric excess

例句：

1. 1.The crystal structure of the compound is characterized by a high degree of stereoisomeric excess.
   该化合物的晶体结构特征是立体异构过量程度高。
2. 2. The study of stereoisomers has led to significant advancements in drug development.
   立体异构体的研究表明，在药物开发方面取得了重大进展。
3. 3. The production process for this material involves a high degree of stereoisomeric excess, which can affect its properties.
   这种材料的生产过程涉及立体异构过量，这会影响其性质。