Ethyl 5-(difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine-3-acetate
Methyl 2-(fluoromethyl)-6-methoxy-3-(trifluoromethoxy)pyridine-5-acetate
Ethyl 3-(difluoromethyl)-4-nitro-5-(trifluoromethoxy)pyridine-2-acetate
Methyl 6-(fluoromethyl)-3-methoxy-2-(trifluoromethoxy)pyridine-4-acetate