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