4-(Difluoromethyl)-3-fluoro-5-methylpyridine-2-sulfonyl chloride
2-(Difluoromethyl)-3-fluoro-5-iodopyridine-4-sulfonyl chloride
2-(Difluoromethyl)-3-fluoro-4-iodopyridine-5-sulfonyl chloride
5-(Difluoromethyl)-2-fluoro-4-hydroxypyridine-3-sulfonyl chloride