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