ethyl 4-methyl-3-oxopyrido[2,3-b]pyrazine-2-carboxylate

2-chloro-3-methylimidazo[4,5-b]pyridine

3-甲基-3H-咪唑并[4,5-b]吡啶

3-甲基-1H-咪唑并[4,5-b]吡啶-2(3H)-酮

(9CI)-1,4-二氢-4-甲基吡啶并[2,3-b]吡嗪-2,3-二酮