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