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