N-[(E)-4-oxopentan-2-ylideneamino]pyridine-4-carboxamide

N-[(E)-pyridin-3-ylmethylideneamino]pyridine-4-carboxamide

N-(dimethylaminomethylideneamino)pyridine-4-carboxamide

甲烟肼

1-phenyl-3-(pyridine-4-carbonylamino)urea