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