Ethyl 5-methyl-2-nitro-3-(trifluoromethoxy)pyridine-4-carboxylate
Ethyl 4-methyl-5-nitro-3-(trifluoromethoxy)pyridine-2-carboxylate
Ethyl 3-methyl-5-nitro-2-(trifluoromethoxy)pyridine-4-carboxylate
Ethyl 3-methyl-4-nitro-2-(trifluoromethoxy)pyridine-5-carboxylate