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