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