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