2-(Difluoromethyl)-5-fluoro-3-hydroxypyridine-4-sulfonyl chloride
2-(Chloromethyl)-5-(difluoromethyl)-3-(trifluoromethyl)pyridine-6-sulfonyl chloride
5-(Bromomethyl)-3-chloro-2-nitro-4-(trifluoromethoxy)pyridine
5-(Chloromethyl)-2-cyano-3-(trifluoromethoxy)pyridine-4-acetic acid