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