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