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