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