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