3-(Bromomethyl)-2-(difluoromethyl)pyridine-4-carboxylic acid
2-(Bromomethyl)-6-(difluoromethyl)pyridine-3-carboxylic acid
4-Cyano-2-(difluoromethyl)pyridine-5-sulfonyl chloride
4-(Chloromethyl)-3-(difluoromethyl)-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride