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