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