3-Hydroxy-4-methoxy-6-(trifluoromethoxy)pyridine-2-sulfonamide
5-Hydroxy-3-nitro-4-(trifluoromethoxy)pyridine-2-carboxylic acid
3-Hydroxy-4-methoxy-2-(trifluoromethoxy)pyridine-6-sulfonamide
3-Hydroxy-5-nitro-2-(trifluoromethoxy)pyridine-4-carboxylic acid