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