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