porphyrin ring

• 卟啉环

porphyrin ring的用法和样例：

例句

1. The chief differences between chlorophyll and heme are the presence of a magnesium atom in the center of the porphyrin ring.
   叶绿素和血红素之间的主要的差别为在卟啉环中心存在一个镁原子。