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