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