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