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