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