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