Ethyl 3-bromo-6-nitro-2-(trifluoromethoxy)pyridine-5-carboxylate
4-Bromo-2-(chloromethyl)-5-nitro-3-(trifluoromethoxy)pyridine
Ethyl 4-bromo-3-nitro-6-(trifluoromethoxy)pyridine-2-carboxylate
3-Bromo-5-(chloromethyl)-4-nitro-2-(trifluoromethoxy)pyridine