3-Cyano-5-hydroxy-4-(trifluoromethoxy)pyridine-2-sulfonyl chloride
2-(Difluoromethyl)-3-fluoro-4-nitro-5-(trifluoromethoxy)pyridine
5-Cyano-4-hydroxy-2-(trifluoromethoxy)pyridine-3-sulfonyl chloride
3-Fluoro-6-(fluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine