protoporphyrin

pro.to.por.phy.rin

n.（名词）
A metal-free porphyrin, C32H 32N 4(COOH) 2, that combines with iron to form the heme of hemoglobin, myoglobin, cytochrome, and other iron-containing proteins.
原卟啉：一种不含金属的卟啉，C32H 32N 4(COOH) 2，与铁结合形成血红蛋白、肌红蛋白、细胞色素和其它含铁蛋白质的血红素