ethyl 4-chloro-7-methylquinoline-3-carboxylate

ethyl 7-oxo-1H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate

diethyl 2-(acetamidomethylidene)propanedioate

2-乙硫基-1,4-二氢-4-氧代-5-嘧啶羧酸乙酯

6-氧代-2-(吡啶-4-基)-1,6-二氢嘧啶-5-羧酸乙酯