5-Cyano-3-nitro-2-(trifluoromethoxy)pyridine-4-carboxylic acid
4-Cyano-3-iodo-2-(trifluoromethoxy)pyridine-5-carboxylic acid
4-Cyano-6-iodo-3-(trifluoromethoxy)pyridine-2-carboxylic acid
5-Cyano-4-nitro-2-(trifluoromethoxy)pyridine-3-carboxylic acid
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