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