2-氯-4-甲硫基吡啶

2-氯-4-(吡咯烷-1-基羰基)吡啶

2-氯吡啶-4-磺酰氯

(4-吡啶基)氨基甲酸叔丁酯

4-bromo-2-propan-2-yloxypyridine