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