A five-membered heterocyclic ring compound, C4H5N, having an odor similar to chloroform. It is the parent compound of hemoglobin, chlorophyll, and many other complex, biologically active substances.

• 叽咯一种五倍杂环混合物，C4H5N，气味与三氯甲烷相似，是血红蛋白，叶绿素和其他多种复杂的生物性活跃的物质的亲体混合物