InChI=1/C6H9NO2/c1-5(4-8)3-7-6(2)9/h3-4H,1-2H3,(H,7,9)/b5-3 N-[(1Z)-2-methyl-3-oxoprop-1-en-1-yl]acetamide acetamide, N-[(1Z)-2-methyl-3-oxo-1-propenyl]-