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