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