2-氯吡啶-4-硫代甲酰胺

1-methylpyridin-1-ium-4-carboxamide

1-Aza-双环[2.2.2]辛烷-4-羧酸

3-硝基-4-吡啶羧胺

1-methyl-2-oxopyridine-4-carboxamide