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