2-(Difluoromethyl)-4-nitro-3-(trifluoromethyl)pyridine-6-sulfonyl chloride
4-(Chloromethyl)-2-(difluoromethyl)-3-(trifluoromethyl)pyridine-6-sulfonyl chloride
5-Chloro-2-mercaptoisonicotinonitrile
4-Bromo-2-(chloromethyl)-6-(difluoromethyl)pyridine-3-acetic acid