ethyl 5-fluoro-2,4-dioxopyrimidine-1-carboxylate

2-甲氧基苯基碳酸乙基脂

4-硝基-N-碳乙氧基邻苯二甲酰亚胺

3-(羟基甲基)-1-哌啶羧酸乙酯

3-benzyl-1,3-benzoxazine-2,4-dione