pyrazine

例句：

1. 1.This compound has a unique pyrazine ring structure.
   这种化合物具有独特的吡嗪环结构。
2. 2. Pyrazine is a key intermediate in the synthesis of many pharmaceutical drugs.
   吡嗪是合成许多药物的中间体的关键成分。
3. 3. The pyrazine ring is responsible for its antimicrobial properties.
   吡嗪环赋予了它抗微生物的特性。