Methyl 3-cyano-2-(difluoromethyl)-4-methoxypyridine-6-carboxylate
Ethyl 2-cyano-3-(difluoromethyl)-5-nitropyridine-4-acetate
Methyl 6-cyano-3-(difluoromethyl)-2-methoxypyridine-4-carboxylate
Methyl 4-cyano-3-(difluoromethyl)-5-nitropyridine-2-acetate