2-Chloro-3-nitro-6-(trifluoromethoxy)pyridine-5-sulfonyl chloride
2-Chloro-3-nitro-5-(trifluoromethoxy)pyridine-4-sulfonyl chloride
3-Cyano-2-nitro-5-(trifluoromethoxy)pyridine-6-carboxylic acid
6-Cyano-4-nitro-3-(trifluoromethoxy)pyridine-2-carboxylic acid