5-(Difluoromethyl)-4-fluoro-3-methylpyridine-2-sulfonyl chloride
3-(Difluoromethyl)-4-fluoro-2-methylpyridine-6-sulfonyl chloride
3-(Difluoromethyl)-2-fluoro-6-methylpyridine-5-sulfonyl chloride
2-(Difluoromethyl)-4-hydroxy-6-iodopyridine-3-sulfonyl chloride