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