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