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