3-氧代哌啶-1-羧酸乙酯

ethyl N-(4-oxopyrano[2,3-b]pyridin-2-yl)carbamate

ethyl N-(3-hydroxy-4-methyl-2-nitrophenyl)carbamate

4-O'-ethyl 4-O-methyl 2-phenyl-5H-1,3-thiazole-4,4-dicarboxylate

3,5-二溴噻吩-2-羧酸乙酯