Methyl 3-(difluoromethyl)-6-methyl-4-nitropyridine-2-acetate
Methyl 5-(difluoromethyl)-2-methyl-3-nitropyridine-6-acetate
Methyl 4-(difluoromethyl)-5-methyl-2-nitropyridine-3-acetate
3-(Chloromethyl)-4-(difluoromethyl)-2-methoxypyridine-6-acetic acid