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