Ethyl 3-bromo-2-(difluoromethyl)-4-nitropyridine-5-carboxylate
6-Bromo-2-(difluoromethyl)-4-methylpyridine-3-sulfonyl chloride
Ethyl 2-bromo-6-(difluoromethyl)-5-nitropyridine-3-carboxylate
Ethyl 2-bromo-6-(difluoromethyl)-4-nitropyridine-3-carboxylate