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