5-氯-2-[(4-乙氧基-4-氧代丁基)(4-甲基苯磺酰基)氨基]苯甲酸甲酯

ethyl 4-(5-nitro-2,4-dioxopyrimidin-1-yl)butanoate

ethyl 4-nitrobutanoate

methyl 2-[(4-ethoxy-4-oxobutyl)amino]benzoate

ethyl 4-(5-amino-2,4-dioxopyrimidin-1-yl)butanoate