4-Hydroxy-2-nitro-5-(trifluoromethoxy)pyridine-3-sulfonyl chloride
6-Hydroxy-4-methoxy-3-(trifluoromethoxy)pyridine-2-carbonyl chloride
5-Hydroxy-3-nitro-2-(trifluoromethoxy)pyridine-4-sulfonyl chloride
2-Hydroxy-4-methoxy-3-(trifluoromethoxy)pyridine-5-carbonyl chloride