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