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