3-(dimethylaminomethylidene)pentane-2,4-dione

3-乙氧亚甲基-2,4-戊二酮

5-乙酰基-6-甲基-2-氧代-1,2-二氢-3-吡啶羧胺

乙酰丙酮

trans-4-amino-3-penten-2-one