Methyl 5-(difluoromethyl)-3-methoxy-2-nitropyridine-4-acetate
Methyl 6-(chloromethyl)-2-(difluoromethyl)-3-methoxypyridine-4-acetate
Methyl 5-(difluoromethyl)-3-methoxy-4-nitropyridine-2-acetate
Methyl 3-(difluoromethyl)-5-methoxy-2-nitropyridine-6-acetate