2-methyl-5-oxo-5,6,7,8-tetrahydroimidazo(1,5-c)pyrimidinium iodide

5,6,7,8-四氢-5-氧代咪唑并[1,5-c]嘧啶

组胺

(1-甲基-1H-咪唑-4-基)乙腈

4(5)-腈甲基咪唑