N-(2-氯乙酰基)-3-氧代丁酰胺

N-(3-oxobutanoyl)pyridine-2-carboxamide

N-(2,6-dimethyl-4-oxopyran-3-carbonyl)pyridine-2-carboxamide

2,6-dimethyl-N-nicotinoyl-4-oxo-4H-pyran-3-carboxamide

N-(3-oxobutanoyl)pyridine-3-carboxamide