Methyl 2-(difluoromethyl)-3-methyl-6-nitropyridine-5-carboxylate
Methyl 2-(difluoromethyl)-3-methyl-5-nitropyridine-6-carboxylate
Methyl 2-(difluoromethyl)-3-methyl-4-nitropyridine-6-carboxylate
3-(Difluoromethyl)-6-methyl-2-nitropyridine-4-carboxylic acid