Methyl 2-(difluoromethyl)-5-methyl-6-nitropyridine-3-carboxylate
2-(Difluoromethyl)-5-methyl-3-nitro-4-(trifluoromethyl)pyridine
Methyl 6-(difluoromethyl)-3-methyl-4-nitropyridine-2-carboxylate
2-(Difluoromethyl)-4-methyl-6-nitro-3-(trifluoromethyl)pyridine