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