Methyl 3-(difluoromethyl)-2-nitro-4-(trifluoromethoxy)pyridine-6-acetate
Methyl 2-(difluoromethyl)-6-nitro-5-(trifluoromethoxy)pyridine-3-acetate
Ethyl 5-(bromomethyl)-4-(difluoromethyl)-2-(trifluoromethoxy)pyridine-3-carboxylate
Ethyl 3-(bromomethyl)-4-(difluoromethyl)-5-(trifluoromethoxy)pyridine-2-carboxylate