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