5-((dimethylamino)(isopropylamino)methylene)-2,2-dimethyl-1,3-dioxane-4,6-dione

5-((tert-butylamino)(methylthio)methylene)-2,2-dimethyl-1,3-dioxane-4,6-dione

N,N-二甲基氰乙酰胺

2,3-dihydro-7-methylthio-5H-thiazolo[3,2-a]pyrimidin-5-one

Cyanoacetyl chloride