4-(Difluoromethyl)-3-nitro-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride
3-(Difluoromethyl)-5-nitro-2-(trifluoromethoxy)pyridine-4-sulfonyl chloride
3-(Difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride
6-(Difluoromethyl)-2-nitro-4-(trifluoromethoxy)pyridine-3-sulfonyl chloride