Methyl 2-(difluoromethyl)-6-methyl-3-nitropyridine-4-carboxylate
Methyl 6-(difluoromethyl)-3-methyl-2-nitropyridine-4-carboxylate
Ethyl 3-(difluoromethyl)-2-methyl-5-nitropyridine-6-carboxylate
Ethyl 3-(difluoromethyl)-2-methyl-4-nitropyridine-6-carboxylate