Ethyl 2-(difluoromethyl)-6-nitro-4-(trifluoromethyl)pyridine-3-acetate
Ethyl 2-(difluoromethyl)-6-nitro-3-(trifluoromethyl)pyridine-5-acetate
Ethyl 2-(difluoromethyl)-6-nitro-3-(trifluoromethyl)pyridine-4-acetate
Ethyl 2-(difluoromethyl)-5-nitro-6-(trifluoromethyl)pyridine-3-acetate