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