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