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