ethyl 2-acetyl-3-aminoacrylate

4-甲基嘧啶-5-甲酸乙酯

2-乙氧亚甲基乙酰乙酸乙酯

ethyl 2-(dimethylaminomethylidene)-3-oxobutanoate

4-甲基-2-羟基嘧啶-5-羧酸乙酯