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