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