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