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