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