Methyl 3-(difluoromethyl)-2-methoxy-6-nitropyridine-5-carboxylate
Methyl 3-(difluoromethyl)-2-methoxy-5-nitropyridine-6-carboxylate
Methyl 3-(difluoromethyl)-2-methoxy-4-nitropyridine-6-carboxylate
4-(Difluoromethyl)-5-methyl-2-nitropyridine-3-acetic acid