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