3-amino-pent-2-enoic acid ethyl ester

乙酰乙酸甲酯

β-氨基巴豆酸甲酯

methyl 1,4-dihydro-2,6-dimethyl-4-oxopyridine-3-carboxylate

2,2,6-三甲基-4H-1,3-二英-4-酮