5-Hydroxy-2-methyl-4-(trifluoromethoxy)pyridine-3-carboxylic acid
4-Hydroxy-5-methyl-2-(trifluoromethoxy)pyridine-3-carboxylic acid
5-Hydroxy-4-methyl-3-(trifluoromethoxy)pyridine-2-methanol
4-Hydroxy-6-methyl-2-(trifluoromethoxy)pyridine-3-carboxylic acid