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