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