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