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