ethyl 1-benzyl-4-chloropyrazolo[3,4-b]pyridine-5-carboxylate

7-甲基-4-氧代-4H-吡啶并[1,2-a]嘧啶-3-羧酸乙酯

diethyl 2-[(phenylhydrazinylidene)methyl]propanedioate

diethyl 4-oxoquinolizine-1,3-dicarboxylate

ethyl 5,8-dimethoxy-4-oxo-1H-quinoline-3-carboxylate