4-溴-2-氯吡啶-3-羧醛

2,3-二溴吡啶

bromo-4 chloro-2 (chloro-2' pyridyl-4')-3 pyridine

5-bromo-6-chloropyridine-2-carbonitrile

ethyl 5-bromo-6-methoxypyridine-2-carboxylate