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