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