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