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