Ethyl 3-(difluoromethyl)-5-nitro-6-(trifluoromethyl)pyridine-2-carboxylate
Ethyl 3-(difluoromethyl)-5-nitro-4-(trifluoromethyl)pyridine-2-carboxylate
Ethyl 3-(difluoromethyl)-5-nitro-2-(trifluoromethyl)pyridine-4-carboxylate
6-(Difluoromethyl)-4-nitro-3-(trifluoromethyl)pyridine-2-acetic acid