N-(5-oxo-2H-furan-4-yl)acetamide

N-(1-acetyl-5-oxo-2H-pyrrol-4-yl)acetamide

N-Acetyl-N-(1-acetyl-2-oxo-2,5-dihydro-1H-pyrrol-3-yl)-acetamide

N-(5-oxo-1,2-dihydropyrrol-4-yl)acetamide

N-(1-acetyl-6-oxo-2,3-dihydropyridin-5-yl)acetamide