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