ethyl 1-(4-chloro-2-nitrophenyl)-5-(2-ethoxy-2-oxoethyl)-1H-1,2,3-triazole-4-carboxylate

3-羧基-1,4-二甲基-吡咯-2-乙酸

6-氯-4-(甲基氨基)烟醛

dimethyl 4-oxo-1H-pyridine-2,6-dicarboxylate

环庚酮