Methyl 3-methoxy-2-nitro-6-(trifluoromethoxy)pyridine-4-carboxylate
Methyl 2-methoxy-6-nitro-5-(trifluoromethoxy)pyridine-3-carboxylate
Methyl 6-methoxy-3-nitro-2-(trifluoromethoxy)pyridine-4-carboxylate
Methyl 2-methoxy-4-nitro-6-(trifluoromethoxy)pyridine-3-carboxylate