3-Cyano-4-(difluoromethyl)-5-hydroxypyridine-2-sulfonyl chloride
3-Cyano-6-(difluoromethyl)-2-hydroxypyridine-4-carbonyl chloride
4-Cyano-5-(difluoromethyl)-2-hydroxypyridine-3-carbonyl chloride
2-Chloro-4-(chloromethyl)-6-(difluoromethyl)pyridine-3-methanol