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