tetrapyrrol

例句：

1. 1. This compound is a key intermediate in the synthesis of tetrapyrrols.
   这种化合物是合成四吡咯的关键中间体。
2. 2. The tetrapyrrol ring has been found in various natural products.
   四吡咯环在各种天然产物中被发现。
3. 3. Tetrapyrrols are known for their ability to bind to proteins and other biological molecules.
   四吡咯因其与蛋白质和其他生物分子的绑定能力而闻名。