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