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