3-(苄氨基)-4-氨基吡啶

2-(4-nitro-1-oxidopyridin-1-ium-3-yl)-3,4-dihydro-1H-isoquinoline

4-氨基-3-溴吡啶

4-nitro-1-oxido-3-phenylsulfanylpyridin-1-ium

N-(3-bromopyridin-4-yl)acetamide