3-(Difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine-6-carboxylic acid
6-(Difluoromethyl)-2-nitro-4-(trifluoromethoxy)pyridine-3-methanol
3-(Difluoromethyl)-2-nitro-6-(trifluoromethoxy)pyridine-4-carboxylic acid
6-(Difluoromethyl)-3-nitro-4-(trifluoromethoxy)pyridine-2-methanol