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