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