丁烯酮

4,4,5,5-四甲基-1,3-二氧戊环-2-酮

1-Methoxy-1-oxo-1H-1λ5-benzo[d][1,2]iodoxol-3-one

氮气

2,3-Dihydroxy-4-methoxy-4-oxobutanoic acid