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