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