1-(4-吡啶基)-1,3-丁二酮

N-叔丁基异烟酰胺

2-(4,5-二氢-3H-吡咯-2-基)-吡啶

N-甲基-4-吡啶甲酰胺

N-hydroxy-1-methylpyridin-1-ium-4-carboxamide,iodide