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