Graebe-Ulmann carbazole synthesis

例句：

1. 1.The synthesis of this compound is crucial for understanding its properties.
   这种化合物的合成对于理解其性质至关重要。
2. 2. The synthesis of the drug was a major breakthrough in medicine.
   该药物的合成是医学领域的一次重大突破。
3. 3.The synthesis process involves complex chemical reactions.
   合成过程涉及复杂的化学反应。