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