3-Hydroxy-6-nitro-2-(trifluoromethoxy)pyridine-5-carboxylic acid
4-Hydroxy-3-nitro-6-(trifluoromethoxy)pyridine-2-carboxylic acid
3-Hydroxy-6-methoxy-4-(trifluoromethoxy)pyridine-2-acetonitrile
4-Hydroxy-3-nitro-2-(trifluoromethoxy)pyridine-6-carboxylic acid