2-溴-3-吡啶甲醛

氰乙酸乙酯

2-(N-叔丁氧羰基氨基)-3-甲基吡啶

草酸二乙酯

1-(tert-butyl) 2-ethyl 2-hydroxy-2,3-dihydro-1H-pyrrolo[2,3-b]pyridine-1,2-dicarboxylate