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