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