ethyl 2-chloro-3-(2-pyrazinyl)aminocrotonate

1-(2-chloroimidazo[1,2-a]pyrazin-3-yl)ethanone

ethyl 7-methyl-5H-pyrrolo[2,3-b]pyrazine-6-carboxylate

Ethyl 2-ethyl-4-methyl-1,3-oxazole-5-carboxylate

4-甲基-2-(4-吡啶)-5-噻唑羧酸乙酯