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