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