Ethyl 2-(difluoromethyl)-4-methoxy-5-nitropyridine-3-carboxylate
Methyl 2-(chloromethyl)-5-(difluoromethyl)-3-iodopyridine-6-carboxylate
Ethyl 3-(difluoromethyl)-5-methoxy-2-methylpyridine-4-carboxylate
Ethyl 3-(difluoromethyl)-2-methoxy-4-methylpyridine-5-carboxylate